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KEAM 2015 Math Paper
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© examsnet.com
Question : 49
Total: 120
Sum of coefficients of the last 6 terms in the expansion of
(
1
+
x
)
n
when the expansion is in ascending powers of x, is
2048
32
512
64
1024
Validate
Solution:
Total terms in the expansion of
(
1
+
x
)
11
=
11
+
1
=
12
∴
Sum of coefficient of last 6 terms
=
Sum of coefficient of all terms
2
=
2
11
2
=
2
10
=
1024
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