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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

A

`2^(n)+2^(n//2)-2^(n//4)`

B

`6^(n)-2.5^(n)+4^(n)`

C

`6^(n)-2.4^(n)+5^(n)`

D

`6^(n)-2.4^(n)+5^(n)`

Text Solution

Verified by Experts

The correct Answer is:
b
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