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Number of 5 digit number having there digits in non decreasing order (from left to right) constructed by using the digits belonging to the set {1, 2, 3, 4, 5, 6, 7, 8, 9} ?
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5 digit no. with non decreasing order is same as selecting five digit and after selection we can arrange that 5 digit only in one way.

  •    if repetition is not allowed we can select  in 9c5.
  •   and if repetition is allowed then we can select in 13c5.

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