Question

in each of the following numbers replace X by the greatest and the smallest digit so that the number formed at divisible by number mention ad 234x2 by 3​

Answer 1

using divisibility of 3

2+3+4+2+? should be divisible by 3

11+1=12 so 1 is the smallest no.

similarly 11+7=18 so 7 is the largest no.