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A1, a1r 1, a1r 2, a1r 3, a1r 4, .... a1r n-1 is the general formula for the Sum of a what?
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A1, a1r 1, a1r 2, a1r 3, a1r 4, .... a1r n-1 is the general formula for the Sum of a what?

User Ryan Ballantyne
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Of a geometric sequence.
User Nam San
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8 + 40 + 200 + ... + 15625000 Sum of a finite geometric series: Sn=a1-a1r / 1-r
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