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With numbers 2, 3, 4, 5, 7 and 9 three-digit numbers are made without repeating, that...

With numbers 2, 3, 4, 5, 7 and 9 three-digit numbers are made without repeating, that is, no 334-type numbers are allowed. How many different numbers can be formed if
a) There are no restrictions
b) Let them be even numbers
c) They are odd numbers

step by step please

Math   Statistics-And-Probability   
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