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[" Sum of the series "],[" S "=1+(1)/(2)...

[" Sum of the series "],[" S "=1+(1)/(2)(1+2)+(1)/(3)(1+2+3)+(1)/(4)(1+2+3+4)+...],[" 20terms is "],[[" 1) "110," 2) "111," 3) "115," 4) "116]]

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