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OpenStudy (anonymous):
What is s10 for 1 + 3 + 9 + 27?
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OpenStudy (anonymous):
use a calculator
OpenStudy (jim766):
it is a geometric sequence, what number does each previous number get multiplied by to get the next number?
OpenStudy (anonymous):
3.
OpenStudy (marissalovescats):
So you keep multiplying by 3 until you get to your 10th term.
OpenStudy (jim766):
the formula is s10 = a1(r)^n-1 r is 3 a1 is the 1st term s10 = 1(3)^9
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OpenStudy (jim766):
what do you get?
OpenStudy (anonymous):
19,683 ?
OpenStudy (jim766):
yup
OpenStudy (anonymous):
Thank you. :)
OpenStudy (jim766):
yw
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