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Mathematics
Mathematics
Problem
If
(
1
+
x
+
x
2
+
x
3
)
5
=
a
0
+
a
1
x
+
a
2
x
2
+
⋯
+
a
15
x
15
(1+x+x^2+x^3)^5 = a_0 + a_1 x + a_2 x^2 + \dots + a_{15} x^{15}
(
1
+
x
+
x
2
+
x
3
)
5
=
a
0
+
a
1
x
+
a
2
x
2
+
⋯
+
a
15
x
15
, then
a
0
a_0
a
0
equals a. 99 b. 100 c. 101 d. 110
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