If a = 3 and b = 4 then,
a x (b x a) - a x (b + a) =
15

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Solution

The correct option is A 15
Here,
a = 3 and b = 4,
a x (b x a)
= 3 x (4 x 3)
= 36
and
a x (b + a)
= 3 x (4 + 3)
= 21
$∴$ 36 - 21 = 15

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