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Mathematics
Problem
Expand and hence evaluate: a.
a
∑
k
=
1
7
k
2
\sum_{k=1}^{7} k^2
∑
k
=
1
7
k
2
b.
b
∑
k
=
1
4
k
+
3
k
+
2
\sum_{k=1}^{4} \frac{k+3}{k+2}
∑
k
=
1
4
k
+
2
k
+
3
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