Q1: If the number 42573 * is exactly divisible by 72, then the minimum value of * is:
A 7
B 6
C 4
D 8
E 5
ANS:C - 6
72 = 9 x8, where 9 and 8 are co-prime.
The minimum value of x for which 73x for which 73x is divisible by 8 is, x = 6.
Sum of digits in 425736 = (4 + 2 + 5 + 7 + 3 + 6) = 27, which is divisible by 9.
Required value of * is 6.
Required value of * is 6.