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Maths-

General

Easy

Question

A is a set containing n elements. A subset P of A is chosen. The set A is reconstructed replacing the elements of P. A subset Q of A is again chosen. The number of ways of choosing P and Q so that P  Q contains exactly two elements is-

9. nC2
3n–2. nC2
2. nCn
None of these

The correct answer is: 3n–2. nC2

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