is a double fault in tennis a first serve?

Yes, two bad serves. First serve is a foul, then second. You wouldn't have a second serve if the first was good.

>>74201585

so are there only 3 types of service outcomes?

good serves, bad serves and double faults? no such thing as a second serve?

>>74201637
There are 3 possible outcomes:

>first serve is good, play continues
>first serve is bad, second serve is good, play continues
>first serve is bad, second serve is bad, opponent gets a point

It's not rocket science.

>>74201563
>2 first serves in a row
>2
>first
Jesus christ you are dumb

>>74201733

don't forget 'let' serves

OP post the full question

>>74201733

>379 first serves

>256 good serves

>15 double faults

>find conditional probability of double faulting

so i must find the probability her first serve is bad, easy enough, but then add the probability that she gets a double fault, but if theres 15 double faults, there is an unknown number of good second serves i dont know i hate this wtf

>>74201745

i dont play tennis i dont know what these strawberry munchers consider good or not

>>74201794
*279 good first serves

You have 2 chance to a legal "good serve".

You take a first serve and if that fails you get a "fault and try again, second serve. If you fail to hit a legal serve again you double fault and lose the point.

https://www.youtube.com/watch?v=SxkWJt2if2o

>>74201745
"let. first service" >>74201777 (ie. serve is nominally good, but clipped the net and so is re-taken with no penalty)
but I don't know if OP is actually dealing with that or if he's just confused though

>>74201794

all the info you need is there.