Find how many five-digit numbers can be made using the digits 2, 3, 4, 5 and 6

Question:

Find how many five-digit numbers can be made using the digits 2, 3, 4, 5 and 6 once each if:

a. There are no restrictions

b. The five-digit number must be:

i. Odd 

ii. Even 

iii. Odd and less than 40000.

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