Question

How many 4 digit numbers are there with no digit repeated if each number is divisible by 5?

Answer 1

none of the 4 digit no is possible ATQ

Answer 2

Answer:

"Four digit numbers" does not allow leading zeros, so consider 1000 - 9999. If repetition is allowed, then every number ending with either 0 or 5 is divisible by five. There are 9000 values and 2 out of 10 (or 1 out of 5) of them are divisible by 5, so 9000/5 = 1800 are divisible by 5 -- if repetition is allowed.

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