Question

show that any possitive integer us form of 3q or 3q+1 or 3q+2 gor some integer

Answer 1

it is in ncert book of maths ex 1.1.......u can check there

Answer 2

Euclid's Division Lemma : For any two positive integers a and b, there exists two unique integers q and r such that a = bq + r, 0r < b.If we take b = 3, the possible values of r will be 0, 1 and 2Hence, either a = 3q or a = 3q + 1 or a = 3q + 2.