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Mathematics
Problem
(
1
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x
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n
=
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(1+x+x^2)^n = a_0 + a_1 x + a_2 x^2 + \dots + a_{2n} x^{2n}
(
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n
=
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a
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Find
a
0
+
a
3
+
a
6
+
a
9
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…
a_0 + a_3 + a_6 + a_9 + \dots
a
0
+
a
3
+
a
6
+
a
9
+
…
.
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