TMUA 2020 Paper 1 Q13 — Worked Solution

P1·Sequences & Series·6.0Official · 2020 · Q13

binomial-expansiontrinomial-as-binomialcoefficient-extraction

Find the coefficient of

x^{2} y^{4}

in the expansion of

(1 + x + y^{2})^{7} .

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