'A' is a set containing n elements. A subset 'P' of 'A' is chosen. The...

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'A' is a set containing n elements. A subset 'P' of 'A' is chosen. The set 'A' is reconstructed byreplacing the elements of 'P', A subset 'Q' of 'A' is again chosen. The number of ways of choosing'P' and 'Q', so that PnQ contains exactly two elements isABD9C?3- "C?2C?none of these

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