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Question

Let set R={P:BPA}
If A={1, 2, 3, 4, 5} and B={1, 2}, then number of elements in set R is

A
2
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B
4
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C
8
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D
16
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Solution

The correct option is C 8
Since P is superset of B so P contains {1, 2}. Now for subset of A, P has all possible combinations of {3, 4, 5} as a set. The subsets of {3, 4, 5}
=23
=8 elements.

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