Given integers a and b, a number n is said to be of the form ak + b if there is an integer k such that ak + b : the form 3k + 1 are - - = n. Thus the numbers of - 8, — 5, — 2, 1, 4, 7, 10, · · · . Prove that - every integer is of the form 3k or of the form 3k + 1 or of the form 3k + 2.

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