42th B.P.S.C. (Pre) 1997-98
If A and B are two sets such that A∪B has 18, A has 8 and B has 15 members then choose the number of members in A∩B—
a0
b5✓ Correct
c23
d26
Explanation
We knot that– A∪B = A + B - (A∩B) A∩B = A + B - (A∪B) = 8 + 15 - 18 (According to question) = 5
general-mental-ability