When a certain number is divided by 7, the remainder is O. But the remainder in not O if the number is divided by 14, what is the number?

When a certain number is divided by 7, the remainder is O. But the remainder in not O if the number is divided by 14, what is the number? Correct Answer 7

The number should be multiple of 7 Let, the number be 21 Now, (21/7) = 3, reminder 0 And (21/14) = 1, reminder 7
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