In a group of 15, 7 can speak spanish , 8 can speak French and 3 can speak neither . What function of the group can speak both Franch and spanish ?
A
1/5
B
4/15
C
1/3
D
7/15
Correct Answer: 1/5
I = n(S) + n(F) - n ( S n F) + Neither 15 = 7 + 8 - n ( S n F) + 3 n ( S n F) = 3 So, required fraction = 3/15 = 1/5