Total number of students = 10
As we have to find
P(A/B) = Probability( A when B has happend)
P(A/B)= P(A intersection B)/P(B)
According to given figure only yolanda and Rob are in both club
Therefore,P(A intersection B)

Number of student in karate club =6
P(B)

P(A/B)

Converting division into multiplication by reciprocating the term after division
P(A/B)

On solving we get ,
P(A/B)

P(A/B)

P(A/B)
