Hi,

How many different 4-digit numbers can be formed from the  digits 2, 3,4,5,6,7, and 8 if: 

a. Repetition of digits is not allowed?  

b. Repetition of digits is allowed? 

c.How many of them are odd numbers? Refer to letter a.

d. How many of them are even numbers?Refer to letter b. 

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