The first series is $\sum_{i=50}^{100}(i-50)$.
The second series is $\sum_{i=0}^{50} i$.
Let's evaluate the first series: $\sum_{i=50}^{100}(i-50)$.
Let $j = i - 50$. When $i = 50$, $j = 50 - 50 = 0$. When $i = 100$, $j = 100 - 50 = 50$.
So, the first series can
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