Question:
Mark (✓) against the correct answer
If 7x8 is exactly divisible by 3, then the least value of x is
(a) 3
(b) 0
(c) 6
(d) 9
Solution:
(b) 0
If a number is exactly divisible by 3, the sum of its digits is also divisible by 3.
$7+x+8=15+x$
$15+x$ can be divisible by 3 even if $x$ is equal to 0 .
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