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Question

If MN=, n(MN)=18 and n(N)=13, then n(M) is _____ .


A

0

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B

18

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C

13

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D

5

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Solution

The correct option is D

5


Given that,

MN=
n(MN)=0

Sets M and N are disjoint, i.e. there are no common elements.

n(MN)=18 and n(N)=13

n(M)=n(MN)n(N)

n(M)=1813=5


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