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2014-10-19T12:22:09+03:00
1/3(1/1-1/4) +1/3(1/4-1/7) + 1/3(1/7-1/10)+..........+1/3(1/301-1/304) =1/3[1-1/4+1/4-1/7+1/7-1/10+..........+1/301-1/304] =1/3(1-1/304) = 1/3 ·303/304 =101/304