Question

$15 {2 {421 {111 \times \frac{?}{?} \times \frac{?}{?} \times \frac{?}{?} }^{?} \times \frac{?}{?} }^{?} }^{?} \times \frac{?}{?}$
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Answer 1

$\huge\pink{\overbrace{\purple{\underbrace{\blue{\mathbf{???}}}}}}$

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