Question

For any positive integer n, prove that n'-n is divisible by 6.​

Answer 1

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first , you have to know the divisibility rule of 6 so the divisibility rule of 6 is when a number can divide with both 2 and 3 so it can be divisible by 6 example: 18 it can be 2÷18 which can be 9 and 3÷18 which can be 6 so if its 18 then divisible by 6 if its -18 then also its divisible by 6