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WAEC Further Mathematics 2017 Paper

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Question : 9

Total: 40

Find the coefficient of

x^{4}

in the expansion of

(1-2x)^{6}

.

-320
-240
240
320

Solution:

${}^{6}C_{4}(1)^{6-4}(-2x)^{4}$ = $15 \times 1 \times 16x^{4} = 240x^{4}$

The coefficient of $x^{4}$ = 240

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