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Mathematics
Mathematics
Problem
Determine the value of
∑
k
=
1
20
(
(
k
+
1
)
3
−
k
3
)
\displaystyle \sum_{k=1}^{20}\bigl((k+1)^{3}-k^{3}\bigr)
k
=
1
∑
20
(
(
k
+
1
)
3
−
k
3
)
. a)
9261
9261
9261
b)
8000
8000
8000
c)
9260
9260
9260
d)
9240
9240
9240
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