1.

Show that any positive even integer can be written in the form 6q, 6q + 2 or 6q + 4, where 4 is an integer.

Answer»

Let a be any positive integer

By division algorithm

a = 6q + r, where 0 ≤ r < 6

a = 6q, 6q + 1, 6q + 2, 6q + 3, 6q + 4, 6q + 5

But a is an even integer

a = 6q, 6q + 2, 6q + 4



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