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Mathematics
Problem
In the expansion of
(
1
+
x
)
(
1
+
x
+
x
2
)
…
(
1
+
x
+
x
2
+
⋯
+
x
2
n
)
(1+x)(1+x+x^2)\dots(1+x+x^2+\dots+x^{2n})
(
1
+
x
)
(
1
+
x
+
x
2
)
…
(
1
+
x
+
x
2
+
⋯
+
x
2
n
)
, the sum of the coefficients is a. 1 b.
2
n
!
2n!
2
n
!
c.
2
n
!
+
1
2n! + 1
2
n
!
+
1
d.
(
2
n
+
1
)
!
(2n + 1)!
(
2
n
+
1
)!
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