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January 25, 2015

January 25, 2015

Posted by **chelsea** on Monday, October 22, 2012 at 3:55am.

- MATHS -
**Reiny**, Monday, October 22, 2012 at 9:11amlooks like a geometric series

5 + 10 + 20 + 40 + ... for 20 terms

a = 5 , r = 2

Sum(2) = 5(2^20 - 1)/(2-1) = 5242875 c

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