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Question 1
If (1 - x + x
2
)
n
= a + a
1
x + a
2
x
2
+ ... + a
2n
x
2n
, then a
0
+ a
2
+ a
4
+ ... + a
2n
is
A.
(3
n
+ 1)/2
B.
(3
n
- 1) / 2
C.
(1 - 3
n
)/2
D.
3
n
+ 1/2
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