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25 August, 00:17

How many different two-digit numbers greater than 50 can be formed from the digits 3,6,7, and 9 of repetition of digits is allowed?

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  1. 25 August, 00:36
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    First of all the repeated digits numbers are 66,77 and 99 Total 3

    Numbers beginning with 6 Total 3 (63,67 and 69).

    Numbers begin with 7 Total3

    and begin with 9 Total 3.

    answer is 12
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