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The number of n-digit numbers which cont...

The number of n-digit numbers which contain the digits 2 and 7, but not the digits 0,1,8,9, is

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Find the number of n digit numbers,which contain the digits 2 and 7, but not the digits 0,1,8,9.

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Find the number of n digit numbers, which contain the digits 2 and 7, but not the digits 0, 1, 8, 9.

Find the number of n digit numbers, which contain the digits 2 and 7, but not the digits 0, 1, 8, 9.

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The number of 3- digit numbers containing the digit 7 exactly once :

The number of 3- digit numbers containing the digit 7 exactly once :

Let N be the number of 4- digit numbers which contain not more than 2 different digits. The sum of the digits of N is :