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Numbers

Q1: If the number 42573 * is exactly divisible by 72, then the minimum value of * is:

A 4

B 5

C 6

D 7

E 8

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.



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