show that one and only one of N, N + 2 and n + 4 is divisible by 3
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Step-by-step explanation:
let N be any natural number
let N= 16
N = 16 (not divisible)
N+2 = 16+2 = 18 (divisible)
N+4 = 16+4 = 20 (not divisible)
only N+2 is divisible
hence proved
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