## anonymous one year ago What is the value of ∑n=13(17n−15)

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1. geerky42

Just to be clear, you want to find the value of n such that $\sum_{i=1}^ni = 13(17n-15)$?

2. geerky42

|dw:1433126788856:dw|

3. zzr0ck3r

$$\sum_{i=1}^n = \frac{n(n+1)}{2}$$