Here is the problem I'm at currently. I'm not sure that I'm on the right track or not. Also I'm not sure what numbers I should be plugging into the equation. I think it would be 2 through 6 but...?(adsbygoogle = window.adsbygoogle || []).push({});

The sum of elements in the set {ti | i = 3 } #7 on top of sigma notation

tn = 2n - 1, n greater than or equal to 1

Here is my calculation so far:

i1 + i2 + i3 + i4 + i5 + i6 + i7 = (1-1)+(2-1)+(3-1)+(4-1)+(5-1)+(6-1)+(7-1)

Where do I go next?

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# Question about Sigma and Sum Notation

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