Evaluate the infinite series $\sum_{k = 1}^\infty \frac{k^2}{2^k}.$
Question:
Evaluate the infinite series $\sum_{k = 1}^\infty \frac{k^2}{2^k}.$
Answer:
Let's think step by step.

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Evaluate the infinite series $\sum_{k = 1}^\infty \frac{k^2}{2^k}.$
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