I need help rewriting in sigma notation. The index beginning starts with 1 and ends with 7. I can't figure out the formula to use. Thanks.
$$\dfrac{25}4 - \dfrac52 + 1 - \dfrac 25 + \dfrac 4{25} - \dfrac 8{125} + \dfrac{16}{625}$$
2026-03-30 07:04:16.1774854256
Rewriting using sigma notation
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Hint:
The first term is $\left(-\dfrac25\right)^{-2},$ and the last is $\left(-\dfrac25\right)^{4}.$
(I used a negative sign to get the terms alternating in sign.)