Question

[Trịnh Quỳnh Hoa]

Exer 1: Find digit a such that n = \(\overline{aaaaa24}\) divisibles by 8 and 9.

Exer 2: Prove that number:

A = (n+2014)(n+2015)(n+2016) is a multiple of 6; where every n \(\in\) N.

Exer 3: Given n = 10¹⁹⁹⁸ - 4.

a, Does n divisibles by 3?

b, Does n divisibles by 9?

And why?