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OpenStudy (anonymous):
find s10 for 1 + 25 + 125 + 625 + 3125
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OpenStudy (campbell_st):
are you sure there isn't a term missing 1 + 5 + 25 + 125+...
OpenStudy (anonymous):
i put 1 + 5 + 25 + 125 + 625 + 3125 that is all
OpenStudy (campbell_st):
ok... so the sum of a geometric series is \[S_{n} = \frac{a( 1 - r^n)}{r - 1}\] your 1st term is a = 1 n = 10 and you need to find the common ratio r... substitute and evaluate
OpenStudy (campbell_st):
the common ratio is what each term is being multiplied by.
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