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14 September, 07:30

How many 5 digit numbers have the property that all their digits are ascending.

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  1. 14 September, 07:35
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    So, for the ascending order, there are only 9 digits to choose from, and hence, there are 9C5 ways to choose the 5 digits. So, there can be 9C5=126 5-digit no. s with their digits in an ascending order.

    126 5
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