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  • Question 1
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    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-

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    In a hall there are 10 bulbs and their 10 buttons. In how many ways this hall can be enlightened?

  • Question 3
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    Let Pn denotes the number of ways of selecting 3 people out of 'n' sitting in a row if no two of them are consecutive and Qn is the corresponding figure when they are in a circle. If Pn – Qn = 6, then 'n' is equal to-

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