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2014-09-01T15:55:58+03:00
2014-09-01T15:57:56+03:00
1+1/2+....+1/16=(( 1/2^{5})-1)/(1/2-1) =2- 1/2^{4} =31/16
1/8*1/4*1/2*1*2*4*8=1/8*1/8*8*8=1