Question

A and B are two sets such that `n(A) = 12, n(B) = 10, A nn B ne phi` and `B cancelsub A`.
The least possible value of `n(A Delta B)` is `"_____"`.
A. 13
B. 4
C. 2
D. 22

Answer 1

Correct Answer - B

`g = 13, d + g = 21, g + f = 17` and `g + e = 52`.
(ii) Number of people who read only one of the newspaper`= a+b+c`.
(i) `n(A Delta B)` is minimum when `n(A nn B)` is maximum.
(ii) Use `n(A Delta B) = n(A uu B) - n(B nn A)`.
(iii) For least possible value of `n(A Delta B) , n(A nn B)` should be maximum.