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Prove that one of every three consecutive integers is divisible by 3.
Ans:
n,n+1,n+2 be three consecutive positive integers
We know that n is of the form 3q, 3q +1, 3q + 2
So we have the following cases
Case - I when n = 3q
In the this case, n is divisible by 3 but n + 1 and n + 2 are not divisible by 3
Case - II When n = 3q + 1
Sub n = 2 = 3q +1 +2 = 3(q +1) is divisible by 3. but n and n+1 are not divisible by 3
Case - III When n = 3q +2
Hence one of n, n + 1 and n + 2 is divisible by 3
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