# Permutations

How many 4-digit numbers can be composed of numbers 1,2,3,4,5,6,7 if:

and, the digits must not be repeated in the number

b, the number should be divisible by 5 and the numbers must not be repeated

c, digits can be repeated

and, the digits must not be repeated in the number

b, the number should be divisible by 5 and the numbers must not be repeated

c, digits can be repeated

### Correct answer:

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