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Divisibility by 5

Suppose a 3-d...

Question

Suppose a 3-digit number is divisible by 3. Prove that is divisible by 9.

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Solution

It is given that is divisible by 3.

⇒ is divisible by 3

⇒ is divisible by 3

⇒ is divisible by 3.

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Divisibility by 5

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