Question
What is the value of $n ?$(a) $\sum_{i=1}^{n} i=\frac{5(5+1)}{2}$ (b) $\sum_{i=1}^{n} i^{2}=\frac{20(20+1)[2(20)+1]}{6}$
Step 1
We are also given that this sum equals $\frac{5(5+1)}{2}$. We can equate these two expressions to find the value of $n$. Show more…
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