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Mathematics
Mathematics
Problem
The value of
∑
r
=
0
10
r
⋅
10
C
r
⋅
3
r
⋅
(
−
2
)
10
−
r
\sum_{r=0}^{10} r \cdot {}^{10}C_r \cdot 3^r \cdot (-2)^{10-r}
∑
r
=
0
10
r
⋅
10
C
r
⋅
3
r
⋅
(
−
2
)
10
−
r
is a. 10 b. 20 c. 30 d. 300
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