CAPE Pure Mathematics Unit 2 · May/June 2017 · Paper 1 · Question Q29
If the coefficient of x^3 in the expansion of (6 - ax)^9 is -84, then the value of a is
- (A)
\frac{1}{36} - (B)
-\frac{1}{36} - (C)
36 - (D)
-36
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