using the digits 2 through 9, find the number of different 5 - digits numbers such that  a. digits can be used more than once b. digits cannot be repeated, but can come in any order c. digits cannot be repeated and must be written in increasing order.

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
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using the digits 2 through 9, find the number of different 5 - digits numbers such that 

a. digits can be used more than once

b. digits cannot be repeated, but can come in any order

c. digits cannot be repeated and must be written in increasing order.

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