lindseyharrison
What is the sum of the geometric sequence 1, 3, 9, … if there are 12 terms?
292,524
265,720
139,968
104,976



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timo86m
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ooh i like these

timo86m
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a=1
r*a^0+r*a^1+r*a^2...

timo86m
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oh wait switch a and r the r has the ^ not the a

ParthKohli
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\[S = {1  r^n \over 1  r} \]

lindseyharrison
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B?

timo86m
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265720

timo86m
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YES :)

lindseyharrison
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yay!! Thank you :)