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Mathematics

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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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Today at 1:16 PM

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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