In the expansion of

MATHEMATICS · Single correct · A Level · Mathematics · Sequences and series · Sequences and series

Problem

In the expansion of

(1+ax)^{10}

, the coefficients of

x^{4}

and

x^{5}

are equal. The value of

a

is (a)

\dfrac{2}{3}

(b)

\dfrac{5}{6}

(c)

\dfrac{6}{5}

(d)

\dfrac{3}{4}

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