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9th Class Mathematics Permutations and Combinations Question Bank Permutation & Combination

  • question_answer
    In how many ways 4 rings of different types can be worn in 3 fingers?

    A) 49                      

    B)        12

    C) 24                       

    D)        81

    E) None of these

    Correct Answer: D

    Solution :

    Explanation Option [d] is correct. First ring can be worn in any of the 3 fingers similarly second, third and fourth ring can be worn in any of the three fingers. \[\therefore \] 4 rings can be worn in \[3\times 3\times 3\times 3=81\] ways.


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