Permutations
How many 4-digit numbers can be composed of numbers 1,2,3,4,5,6,7 if:
a, the digits must not be repeated in the number
b, the number should be divisible by five, and the numbers must not be repeated
c, digits can be repeated
a, the digits must not be repeated in the number
b, the number should be divisible by five, and the numbers must not be repeated
c, digits can be repeated
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