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Numbers - General Aptitude

Q1:

If the number 481 * 673 is completely divisible by 9, then the smallest whole number in place of * will be:

A 2

B 5

C 6

D 7

E None of these

ANS:D - 7

Sum of digits = (4 + 8 + 1 + x + 6 + 7 + 3) = (29 + x), which must be divisible by 9.    x = 7.