The number of nine digit numbers that can be formed with different digits is &#x

Question

The number of nine digit numbers that can be formed with different digits is

Options:

A . 9.8!

B . 8.9!

C . 9.9!

D . 10!

Answer: Option C
:
C
Required number numbers = total - the number of numbers begining with 0 =

10! - 9! = 9.9!

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