Question

how many three digits number are divisible by 3

Answer 1

There are 900 three-digit numbers, namely 100, 101, 102, ..., 999. The first three-digit number that is exactly divisible by 3 is 102 and the last is obviously 999. The numbers 102, 105, 108, ..., 999 form an arithmetic progression with common difference, d = 3.

Answer 2

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There are 900 three-digit numbers, namely 100, 101, 102, ..., 999. The first three-digit number that is exactly divisible by 3 is 102 and the last is obviously 999. The numbers 102, 105,108, ..., 999 form an arithmetic progression with common difference, d = 3.
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