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

  • question_answer
    In how many ways can five examination papers be arranged so that physics and chemistry papers never come together

    A) 31

    B) 48

    C) 60

    D) 72

    Correct Answer: D

    Solution :

    Total arrangements of 5 papers are \[=5\ !=120\] When physics and chemistry come together \[=4\ !\ \times 2\ !=48\] Hence required number of ways are \[120-48=72\].

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