Multiple choice general knowledge math & puzzles

How do you identify if a number is divisible by 3?

  1. Sum for the digits in number mustbe divisible by 3

  2. The number must have '3' in units place

  3. Number must be Odd.

  4. Can't say
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A Correct answer
Explanation

A number is divisible by 3 if and only if the sum of its digits is divisible by 3. For example, 123 is divisible by 3 because 1+2+3=6, which is divisible by 3. This rule works for all positive integers.

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