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OpenStudy (anonymous):
Find the sum of the geometric sequence. 1, one divided by four, one divided by sixteen, one divided by sixty four, one divided by two hundred and fifty six
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OpenStudy (anonymous):
if you could help it would be appreciated @ganeshie8 @mathslover @tkhunny @mathmale
OpenStudy (anonymous):
i understand you must use the formula sum=n(a1+an)/2
OpenStudy (anonymous):
but im just having a hard time plugging in the numbers as i cannot distinguish the n value would i need to do the an=a1+(n-1)d formula
OpenStudy (anonymous):
if thats necessary i got -54
OpenStudy (anonymous):
Well all I can say it that it is being multiplied by 4, but that was probably obvious :/
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OpenStudy (anonymous):
wait i posted the wrong question
OpenStudy (anonymous):
Find the sum of the first 12 terms of the sequence. Show all work for full credit. 1, -4, -9, -14, . . .
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