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Q.

The Number of possible digits for $' x'$ such that $10 x 78 x$ is divisible by $3$ is

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a

1

b

7

c

3

d

5

answer is B.

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Detailed Solution

By divisibility rule of 3

$10 + x + 7 + 8 + x = 3$ multiple

$25 + 2 x = 3$ multiple

For $x = 1, 4, 7$

$25 + 2 x$ will be 3 multiple

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The Number of possible digits for 'x' such that 10x78x is divisible by 3 is