If $m = 3$ and $n = 2$ , then $(2 m + 3 n)^{2} =$

12

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169

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144

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121

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Solution

The correct option is C $144$
Substituting: $m = 3, n = 2$ in $(2 m + 3 n)$
We get,
$(2 \times 3 + 3 \times 2)^{2}$
$= (6 + 6)^{2}$
$= 12^{2}$
$= 144$

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