Question: Please answer clearly and in detail 3. Points=4 Prove if the sum of the digits of a 3 digit number n is divisible by 9,

Please answer clearly and in detail

3. Points=4 Prove if the sum of the digits of a 3 digit number n is divisible by 9, then n is divisible by 9. 4. Points=4 Prove by contradiction that the product of two odd numbers is odd

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