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OpenStudy (anonymous):
find a1 in a geometric series for which S12=3071.25 and r=2
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OpenStudy (cwrw238):
use the formula for sum of n terms:- Sn = a1 (r^n - 1) ------- r - 1
OpenStudy (anonymous):
substitute the values @tbaker789
OpenStudy (anonymous):
al= Sn x (r-1) all over (r^n-1)
OpenStudy (cwrw238):
you have n = 12 , r = 2 and Sn = 3071.25 plug these into the formula and solve for a1
OpenStudy (anonymous):
ok i got it
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OpenStudy (anonymous):
nice @tbaker789
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