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

Correct answer:

a =  840
b =  120
c =  2401

Step-by-step explanation:

a=7 6 5 4=840
b=6 5 4 1=120
c=74=2401



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