Question

If n(A)=10, n(B)=20, c=5 in the given Venn diagram. Find a and b.

(a) a=10 and b=15

(b) a=5 and b=15

(c) a=15 and b=10

(d) a=15 and b=5

This question was addressed to me in exam.

Question is taken from Venn Diagrams in division Sets of Mathematics – Class 11

Answer 1

Correct option is (b) a=5 and b=15

The explanation: From the given diagram, a + c = 10 => a+5=10 => a=5

and b + c = 20 => b+5=20 => b=15