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I think the formula is just n+1. And since it says that there are 5 poles, we take the first n as 4. For the last n, we take 29 since the bottom row has 30 poles.

Therefore we take th sum of the summation of n=4 to n=29 (n+1).

The answer is 455 poles in total.

Sorry if I wasn't able to give further explanation to this. There are no available equations for sigma here. ^^;
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