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OpenStudy (anonymous):
S6 for 2+1+1/2+1/4. I cant get it into sum form. Can you help me
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OpenStudy (cwrw238):
this is a geometric series with common ratio 1/2 the sum of n terms Sn = a1 * (1 - r^n) ------- ( 1 - r) where a1 = first term and r = common ratio to get S6 plug in n=6, r=1/2 and a1 = 2
OpenStudy (cwrw238):
oh - they've gone!
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