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KEAM 2020 Math Paper
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© examsnet.com
Question : 28
Total: 120
The sum of the coefficients in the expansion of
(
1
+
2
x
−
x
2
)
20
is
2
20
2
21
2
19
2
40
2
Validate
Solution:
Put
x
=
1
(
1
+
2
−
1
)
20
=
2
20
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