The number of terms in the expansion of $(1 + 2x + x^2)^{10}$ is:
Step-by-Step Solution
Key Concept: Notice that the expression inside the brackets is a perfect square — rewrite $1 + 2x + x^2$ as $(1 + x)^2$ and simplify the whole expression to a single binomial power before counting its terms.
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Correct Answer: (3)