Mathematics: Write the sum using summation notation, assuming the suggested pattern continues. 1 - 3 + 9 - 27 +

Write the sum using summation notation, assuming

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Inktown4life0

04.01.2022

Σ-3^(n-1) for n=[1,n]

Angie above is correct though as there is no sum for this as an infinite series as r^2>1.

The only time infinite series have a sum is if r^2<1, and that sum is just s=a/(1-r)

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chris858232

28.12.2021

Mathematics

see the attachment

Step-by-step explanation:

It helps to follow along the proof and consider how you get from here to there.

In the 5th line, we have a sum in symbols.

In the 7th line, we have an expression with a number on the right side, and a statement that says we got there by subtraction.

Then we expect line 6 to have a sum with numbers whose difference is 40°. (That eliminates the 3rd and 4th choices.)

The way you get from an expression with symbols to an expression with numbers is to make a substitution of numbers for symbols. Hence the appropriate choice is the one shown below.

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Write the sum using summation notation, assuming the suggested pattern continues. 1 - 3 + 9 - 27 +

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