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(
∑
r
=
0
10
10
C
r
)
(
∑
r
=
0
10
(
−
1
)
r
10
C
r
2
r
)
\left( \sum_{r=0}^{10} {}^{10} C_r \right) \left( \sum_{r=0}^{10} (-1)^r \frac{{}^{10} C_r}{2^r} \right)
(
∑
r
=
0
10
10
C
r
)
(
∑
r
=
0
10
(
−
1
)
r
2
r
10
C
r
)
…
Mathematics
Problem
(
∑
r
=
0
10
10
C
r
)
(
∑
r
=
0
10
(
−
1
)
r
10
C
r
2
r
)
\left( \sum_{r=0}^{10} {}^{10} C_r \right) \left( \sum_{r=0}^{10} (-1)^r \frac{{}^{10} C_r}{2^r} \right)
(
∑
r
=
0
10
10
C
r
)
(
∑
r
=
0
10
(
−
1
)
r
2
r
10
C
r
)
is equal to a. 1 b. 2^5 c. 2^10 d. 2^20
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