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Question

Two finite sets have m and n elements. The total number of subsets of the first set is 56 more than the total number of subsets of the second set. The values of m and n are

A
7,6
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B
6,3
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C
5,1
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D
8,7
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Solution

The correct option is B 6,3
The number of subsets of a set containing p elements = 2p
Here, 2m2n=56
The values of n and n satisfying the given equations form the given option are 6,3.
2623=648=56.

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