TMUA Practice Question — Worked Solution

P1·Sequences & Series·6.0Mock 0 · P1 · Q5

binomial expansionratio of consecutive coefficientsquadratic in nrejected root

In the expansion of

(1 + k x)^{n},

where

k

is a constant and

n

is a positive integer, the coefficient of

x^{2}

and the coefficient of

x^{3}

are both equal to

7

.What is the coefficient of

x^{4}

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