Can you solve this?

Yeah but I'm not gonna

>>733263057
All 4...

D and 7 no?

>>733263057
Two. I'd have to turn the D and look for a 3 and I'd have to turn the 7 and look for a D

Flip d if it's a 3 it's varified

D and 3. Is this supposed to be difficult?

Explanation: We require that D on one side implies 3 on the other, but also that no 3 on one side implies no D on the other. So we must turn over D to verify that there is a 3 on the other side, but also turn over the 7 to verify there is no D on the other side.

So 2.

>>733263057
How many sides do the cards have?

File: 1487751878938.jpg (7KB, 255x220px) Image search: [Google]

7KB, 255x220px

>>733263346
But it claims that EVERY card has a number and a letter on it, so you must turn over ALL of them

>>733263266
>Is this supposed to be difficult?
>Gives wrong answer
Oh /b/

>>733263451
Read carefully. Thats not a Claim, thats a fact

>>733263057
2 if F has a 7 behind it and 3 if not.

You only have to turn D.

The claim is that a D will have a 3 on the back. NOT that 3 will have a D on the back, NOT that others will have D, only that D will have a 3.

Turn the D, if it's a 3, the claim is true and the number of cards turned is 1.

>>733263057
Fuck /b is so dumb. Turn D F and 7, so 3

>>733263451
It doesn't matter what is on the other side of the F or the 3, since it's claiming that IF there's a D THEN there's a 3 on the otherside, not that IF there's a 3 THEN there's a D on the otherside.

>>733263611
It says other side, not back.
You'd have to check 7 to see letter it's paired with you dip

It's 0......
You don't "have" to turn over any cards.
You could just pick them up and look at the other side then lay them back down

>>733263622
>Fuck /b is so dumb.
>Gives wrong answer
Shit's hilarious

>>733263742
No, you wouldn't. It doesn't say 3 is only paired with D, it's only claiming that D has 3 on the other side.

Turn the D card over and you have your answer.

>>733263411
Clever

>>733263411
It's a fucking card, what do you think?

All 4

>>733263946
Assume you did that and there's a d on the other side of 7....
You'd say the claim is true even though there's a 7-d card pair.

>>733263057
3
D F 7
3 itself does not matter because 3 is not limited to D

2 because we don't care about F and 7, as they are not a part of the claim.

Easy. Go back to school.

>>733263946
But what if on the other side of the 7 card you see a D? Then what is claimed isn't true.

The real trick in this question is the minimum is technically 1, but that's only if the D card does not have a 3 on the other side. The minimum to cover both possible outcomes is to turn over the 7 card as well to verify whether there is a D on the other side or not.

>>733264111
Why flip F? It says they're in letter/number pairs

>>733264111
And what do you expect tobe on the other side of F to prove the claim wrong?

>>733264072
Yes. Because that's ALL it's asking. It's not asking that EVERY card is like that.

It's fucking basic. Is there a 3 on the other side of the D card? Yes or no. Not if there's a D or 3 anywhere else.

>>733264138
>Easy.
>Gives wrong answer
Definitly trolling

>>733264226
>Says it's wrong
>Calls me troll
Is definitely a troll

You have to turn each card showing a "D" to verify whether or not the back is a "3".
You also have to turn every number that is not a "3" to confirm whether or not they show a "D".

In this example you need to turn "D" and "7".

1. Card D -> flip, see if there is a 3.
2. Card F -> don't flip, we don't care about F's
3. Card 3 -> don't flip, coz there's no rule that forbids any other letter to show a 3 behind it.
4. Card 7 -> flip, to prove that there is no D behind it.

>>733264272
Holy shit you're really this stupid

>>733264286
Are you trolling?
You have to flip 3 to make sure there's a d on the other side

>>733264426
No, there is no rule that says that any other letter isn't allowed to show a 3 behind it.

The rule is only if there is a D on one side, the back has to be a 3.

>>733264143
>The real trick in this question is the minimum is technically 1
Smartest guy in this thread

>>733264516
But that's wrong. You also have to check the 7 to make sure there's no D on the other side.

>>733264598
You've missed the trick. If you turn over the D card and there is no 3, then you have proved the claim incorrect, so you need only turn over 1 card. But, if you turn over the D card and there IS a 3, that is when you also need to turn over the 7 to check whether or not there is a D, then you know the answer.

>>733264598
That's what he's saying.

But technically speaking if you switch the D and there's something other than a 3, you'd prove the claim wrong switching only one card.
It wouldn't matter whats on the other side of F because the claim would already be proven wrong

>>733264516
ty anon. Burst of encouragement from a stranger in the midst of my exams.

>>733264802
No.

You have been asked to state the minimum to show the claim"holds up" aka is true.

1 is the minimum possible to show it is false. 2 is the minimum to show it is true.

>>733264796
oh damn, I missed that. nice

>>733264917
But you are wrong

>>733264917
Well, being the smartest guy in a /b/-thread isn't that much of an accomplishment. But anyway, good luck for your exams, I believe you'll do good.

>>733265025
>"whether the claim holds up (or not)"
Reading comprehension

>>733263057
1

either d or 3

?

D and 7. If you say anything else you are retarded.

>>733265025
The minimum to show the claim doesn't hold up is different from the minimum to show the claim does hold up. You can invalidate it with one flip, but you can only validate with 3.

>>733265170
U r rong

>>733265483
>only validate with 3.
Try again

>>733265170
>>whether the claim holds up
Fixed that for you.
If you had a brain cell you would know that it makes a difference if they are asking you to prove or disprove.

>>733265483
Yes fuckwit. 1 is different to 2. Thats what i said. You are wrong about needing 3 turns to prove but enough other people have explained why. Read the thread dunce.

>>733265483
>can only validate with 3.

Moron.

We are proving D implies 3.

Not 3 if and only if D.

all except 3
shit says if theres D on one side there has to be 3 on other , 3 may have other letters but if F or 7 has D on other side then thing is fucked

>>733265943
i dont trust that nigger if theres no D together with F

>>733265943
Read the fact. Here is another fact: you are a fucking retard.

>>733263057
Flip over D, if it's not 3, the claim doesn't hold up.

or

Flip over 3, if it's not D, the claim doesn't hold up.

or

Flip over D, if it's 3, then you must flip over 3, and if that's D, then the claim does hold up.

F and 7 have no reason to be involved since they are not involved in the claim.

im gonna go with 1 card needed, since its fact every card has a number and a letter on either end just flip over d to verify if the claim is true or not, if it is then 3 has d on the other end, if it isnt true then it's verified either way.

>>733266286
the fact is youre a virgin loser
cant be sure of anything else

>>733265671
It does make a difference, but the post isn't especially asking to prove the claim.

It asks to prove or disprove the claim. " 'Whether' the claim holds up" doesn't impy it does hold up.

>>733266321
>Flip over 3, if it's not D, the claim doesn't hold up

Wrong. See >>733265908

>>733266524
>the post isn't especially asking to prove the claim.

Yes it is

>>733266613
How?

>>733263057
Just because one D has a 3 on the other side doesn't mean all D have 3 on the other side.

Making that assumption based on just flipping over the D is a fallacy of composition.

>>733266613
It reads "to verify whether the claim holds up"
Not "to verify THAT the claim holds up"
Doesn't that makes a difference?

>>733266377
Ahhh, but you fell for it. The fact doesn't say that every card has the same PAIR of numbers/letters on each side. They could simply be random...

>>733266573
Well, that makes it too easy. All you have to do is flip D.

>inb4 smartfags try to make it more difficult than it has to be.

I'd say you have to flip two cards to make sure. D and 7. Then when I flip them I see if the D has a 3 and if the 7 doesn't have a D.

>>733266822
Troll

>>733263231
You also need to flip the 7

>>733263611
The logical converse of "All Ds have 3s" is that non-3s are not Ds.

So you have to turn 7 as well.

>>733264210
It's asking you to verify the claim that all D cards have a 3 on the other side. That means you have to check the D cards as well as any numeral that is not 3. If the 7 has a D, that means the claim that ALL Ds have 3s is false, because that D has a 7

>>733263057
To settle this debate

The claim is: IF D on one side THEN 3 on the other side.
So all we have to do to disprove the statement is to find a D with something other on his back than a 3.

So we switch the first card to see if the back has a 3.
We don't switch the second card, because on the front side already is a three and we only search a D-Card with something other than a 3 on his back.
We don't switch the third card because there is a F on it's front and we only search D's.
We do switch the last card because there could be a D on it's back. If so, we'd have found what we were looking for: A D with something other on it's back than a 3.

So the answer is, we switch two cards. The first and the last.

>>733265943
The stated fact is that each card has one letter and one number. You don't need to flip F

All of you can flip my D...

You people need to read more carefully. "What is the SMALLEST number of cards that you have to turn..."

If you flip D and get something other than 3 then the claim is false and no further flips are necessary.

The answer is ONE.

>>733268744
Retard

>>733268744
>If

Cunt

>>733263057
This is known as a Wason selection task, a logical puzzle. Nice one anon