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‘n’ digit positive integers formed such ...

‘n’ digit positive integers formed such that each digit is 1, 2, or 3. How many of these contain all three of the digits 1, 2, and 3 at-least once?

A

`3(n-1)`

B

`3^(n)-2*2^(n)+3`

C

`3^(n)-3*2^(n)-3`

D

`3^(n)-3*2^(n)+3`

Text Solution

Verified by Experts

The correct Answer is:
D
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