Problem 16E

16. (a) Explain the difference between

$$\sum_{i=1}^{n} a_{i} \quad \text { and } \quad \sum_{j=1}^{n} a_{j}$$

(b) Explain the difference between

$$\sum_{i=1}^{n} a_{i} \quad \text { and } \: \sum_{i=1}^{n} a_{j}$$

 

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