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If 381A is divisible by 9, find the value of the smallest natural number A?

a) 5
b) 8
c) 6
d) 9

Answer: c
Explanation: A number is divisible by 9 when the sum of its digit is divisible by 9
So, (3 + 8 + 1 + A) = must be divisible by 9
Thus, smallest natural number be 6
(3 + 8 + 1 + 6) = 18, this is divisible by 9

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