Calculate | quarter to half | + | sixth to quarter | + | eighth to sixth | + · + | 208 to 206
Original formula = 1 / 2-1 / 4 + 1 / 4-1 / 6 + 1 / 6-1 / 8 +. + 1 / 2006 + 1 / 2008
=1/2-1/2008
=1003/2008
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