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Question

The following information is given sets A, B which are subsets of universal set U.

n(U) = 47

n(A) = 18

n(B) = 11, n(A B) = 10

Then, the number of elements that are neither in A nor in B is ____


A
28
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B

28

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C

42

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D

44

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Solution

The correct option is B

28


Then, the number of elements that are neither in A nor in B is given by n(AI BI)

n(AI BI) = n(A U B)I = n(U) - n(A U B)

= n(U) - [n(A) + n(B) - n(A∩B)]

= 47 - [18 + 11 - 10]

= 47 - 19

= 28


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