The least value of $x$ if $231 x 4$ is divisible by $9$ be

$3$

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$6$

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$8$

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$9$

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Solution

The correct option is C
$8$

Divisibility of 9 - sum of the digits is divisible by 9
Sum of digits $= 2 + 3 + 1 + x + 4 = 10 + x$
The nearest multiple of $9$ is $10 + 8 = 18$
So $8$ should be added.
Hence option (C) is the correct option.

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