In $(2x + 3)^{4}$, the coefficient of $x^{2}$ is:
A$108$
B$324$
C$54$
D$216$
Answer & Solution
Correct answer: D. $216$
$\binom{4}{2}(2x)^{2}(3)^{2} = 6 \cdot 4 \cdot 9 \cdot x^{2} = 216 x^{2}$.
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