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If n(U) = 50, n(A) = 20, n(AuuB)' = 18 t...

If n(U) = 50, n(A) = 20, `n(AuuB)' = 18` then `n(B- A)` is

A

20

B

30

C

42

D

45

Text Solution

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The correct Answer is:
B
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AAKASH INSTITUTE ENGLISH-SETS -SECTION-A(Objective Type Questions (One option is correct))
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  16. If n(U) = 50, n(A) = 20, n(AuuB)' = 18 then n(B- A) is

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