Question

tap hop cac so nguyen n sao cho 169 chia het cho (3n+1)

nE{................................}

Answer 1

169 chia hết 3n+1 => 3n+1\(\varepsilon\)Ư(3n+1)

3n+1	-169	-13	-1	1	13	169
n	-506	-38	-2	4	40	508

Mà n\(\varepsilon\)Z => n\(\varepsilon\){-506;-38;-2;4;40;508}