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[" 5.The sum of the first "20" terms of ...

[" 5.The sum of the first "20" terms of the series "],[(1)/(5times6)+(1)/(6times7)+(1)/(7times8)+..." is "],[[" (a) "0.16," (b) "1.6],[" (c) "16," (d) "0.06]]

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