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Mathematics
Mathematics
Problem
- If
(
1
+
2
x
+
3
x
2
)
10
=
a
0
+
a
1
x
+
a
2
x
2
+
⋯
+
a
20
x
20
(1+2x+3x^2)^{10} = a_0 + a_1 x + a_2 x^2 + \dots + a_{20} x^{20}
(
1
+
2
x
+
3
x
2
)
10
=
a
0
+
a
1
x
+
a
2
x
2
+
⋯
+
a
20
x
20
, then
a
1
a_1
a
1
equals a. 210 b. 20 c. 10 d. None of these
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