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OpenStudy (anonymous):
2,6,8,54 find the sum of the 15th term
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OpenStudy (anonymous):
the first 15th terms
OpenStudy (anonymous):
u sure its 54?
OpenStudy (anonymous):
yes it says 54
OpenStudy (anonymous):
2, 6, 18,54
OpenStudy (anonymous):
okay...so its a g.p with r=3
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OpenStudy (anonymous):
S= a(r^n-1)/r-1. rest is up to you ;)
OpenStudy (anonymous):
ok thaks
OpenStudy (anonymous):
14348906
OpenStudy (anonymous):
3^15-1
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