9. The probability of pulling a black bal out of a glass jar is 1/x. The probability of pulling a black ball out of a glass jar and breaking the jar is 1/y. What is the probability of breaking the jar?
I thought it would be 1/(x-y) but that is wrong the answer is X/Y
Help me understand.
Let A - prb. of taking the ball out
B - prob. of breaking the jar
P(AB) = P(A) * P(B)
1/y = 1/x * P(B)
p(B) = x/y