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Question

For any two sets A & B, if n(AB)=100;n(A)=45,n(B)=60, then n(AB)=

A
5
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B
15
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C
0
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Solution

The correct option is A 5
Given for two sets A & B
n(AB)=100;n(A)=45,n(B)=60

Now, we know:
n(AB)=n(A)+n(B)n(AB)
n(AB)=n(A)+n(B)n(AB)
n(AB)=45+60100=5

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