# Write the expression as sigma notation

Arithmetic and Geometric progressions.

### Write the expression as sigma notation

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I'm stuck, please help. I found a pattern for the numerator but I can't seem to find a pattern for the denominator. Is there something I'm missing out?
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### Re: Write the expression as sigma notation

What pattern did you find for the numerator? That doesn't seem at all simple, especially without knowing what index that "-23/80" corresponds to.

HallsofIvy

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