What is the coefficient of the x4-term in the binomial expansion of (x + 3)12?

By the binomial theorem, the term containing x⁴ is formed by choosing x from 4 of the 12 factors and 3 from the remaining 8. Its coefficient is ¹²C₄ · 3⁸, which equals ¹²C₈ · 3⁸ because ¹²C₄ = ¹²C₈. Therefore, the correct choice is ¹²C₈(3)⁸.

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