Trinomial Coefficient 2

Find the coefficient of $x^{4}$ in the expansion of $(1 + 2 x + 3 x^{2})^{10}$ .

~8 minAnswer checked instantlyMultinomial TheoremPolynomial Expansion

H. S. Hall & S. R. Knight, Higher Algebra (1891) · Ch. XV. Multinomial Theorem, Examples XV, No. 6

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Checked against the answer in H. S. Hall & S. R. Knight, Higher Algebra (1891).