Question

Pick out the numbers from the following that are divisible by 3 but not by 9.
(a) 38721 (b) 422679 (c) 6110586 (d) 257796

Answer 1

take option a

38721= 3+8+7+2+1

=21

this is divisible by 3 but not by 9

take option b

422679=4+2+2+6+7+9

=30

this is divisible by 3 but not by 9

take option c

6110586=6+1+1+0+5+8+6

=27

this is divisible by 3 &9

take option d

257796= 2+5+7+7+9+6

=36

this is divisible by 3 &9

option a&c are divisible by 3 but not by 9