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Foundations
hard
0:00.0
Evaluate
∑
k
=
1
3
(
k
2
+
2
k
)
\sum_{k=1}^{3} (k^2 + 2k)
∑
k
=
1
3
(
k
2
+
2
k
)
A
20
20
20
B
22
22
22
C
18
18
18
D
24
24
24
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