Find the values of (i) 7P5 (ii) 10P3 from Mathematics Permut
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    Permutations and Combinations

    Multiple Choice QuestionsShort Answer Type

    91. Find the number of ways in which n books on mathematics and n books on chemistry can be placed alternatively on a shelf.
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    Find n, if P (2n, 3) = 100 P (n, 2)

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    93.

    If 2 P (5, 3) = P (n, 4), find n

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    94.

    Find r, if P (11, r) = P (12, r - 1)

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    95.

    Find r, if P (10, r + 1) : P(11, r) = 30 : 11

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    96. Find n, if 30 P (n, 6) = P (n + 2, 7)
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    97. Prove that : P (10, 3) = P (9, 3) + 3P (9, 2)
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    98. Prove that : P (n, n) = 2P (n, n – 2)
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    99. Find, r if P (5, r) = P(6, r – 1)
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    100. Find the values of (i) 7P5 (ii) 10P3

    Solution not provided.

    Ans. (i) 2520    (ii) 720

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