MathematicsThe number of six digits numbers in which digits are in ascending order must be

The number of six digits numbers in which digits are in ascending order must be


  1. A
    48
  2. B
    84
  3. C
    120
  4. D
    126 

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    Solution:

    six-digit number in which
    digit is in ascending order.
    select 6 digits out of 9
    then there is only one way to average it in ascending order.
    Total ways= 9C6=9×5×7×6!3!6!=9×8×73×2=84
    Hence 2 is the correct option.
     
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