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## Homework Statement

1 and 2 take turns shooting at a target. Each time 1 shoots he hits the target with probability p

_{1}; 2 hits it with probability p

_{2}each time. 1 shoots first. They stop when the target has been hit twice. What is the probability that...

a) The first hit was by 1 ?

b) Both hits were by 1?

c)Both hits were by 2?

## Homework Equations

Conditional probability?

## The Attempt at a Solution

Actually I'm a little (very) rusty. I took probability a year ago, and I just don't know how to start it.

I'm totally lost here.

Would appreciate any help.

Thanks,

Roni.