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Find the number of n digit numbers, whic...

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

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

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The correct Answer is:
b
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