JEE Main & Advanced Mathematics Permutations and Combinations Question Bank Definition of permutation, Number of permutations with or without repetition, Conditional permutations

  • question_answer
    If \[^{12}{{P}_{r}}=1320\], then r is equal to [Pb. CET 2004]

    A) 5

    B) 4

    C) 3

    D) 2

    Correct Answer: C

    Solution :

    Since\[^{12}{{P}_{3}}=1320;\,\,\therefore \,\,r=3\].

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