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WAEC Further Mathematics 2017 Paper
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© africaexams.com
Question : 9
Total: 40
Find the coefficient of
x
4
in the expansion of
(
1
−
2
x
)
6
.
-320
-240
240
320
Validate
Solution:
6
C
4
(
1
)
6
−
4
(
−
2
x
)
4
=
15
×
1
×
16
x
4
=
240
x
4
The coefficient of
x
4
= 240
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