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Question
Mathematics
The sum of the co-efficients in the expansion of (1-2 x+5 x2)n is ' a ' and the sum of the coefficients in the expansion of (1+x)2 n is b. Then :
Q. The sum of the co-efficients in the expansion of
(
1
−
2
x
+
5
x
2
)
n
is '
a
' and the sum of the coefficients in the expansion of
(
1
+
x
)
2
n
is
b
. Then :
254
167
Binomial Theorem
Report Error
A
a
=
b
B
a
=
b
2
C
a
2
=
b
D
ab
=
1
Solution:
a
=
4
n
;
b
=
2
2
n
=
4
n