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Mathematics
Mathematics
Problem
Find the value of
∑
k
=
1
25
(
7
+
2
(
k
−
1
)
)
\displaystyle \sum_{k=1}^{25} \bigl(7+2(k-1)\bigr)
k
=
1
∑
25
(
7
+
2
(
k
−
1
)
)
.
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