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[1-(1)/(5)+(1*4)/(5.10)-(1.4*7)/(5*10*15...

[1-(1)/(5)+(1*4)/(5.10)-(1.4*7)/(5*10*15)+........oo=],[" (A) "(1)/(3)root(3)(5)],[" (B) "(1)/(2)root(3)(5)],[" (C) "(1)/(2)root(3)(4)],[" (D) "root(3)(5)]

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1-(1)/(5)+(1.4)/(5.10) - (1.5.7)/(5.10.15)+…..=

1-(1)/(5)+(1.4)/(5.10) - (1.5.7)/(5.10.15)+…..=

(1.4)/(5.10)-(1.4.7)/(5.10.15)+(1.4.7.10)/(5.10.15.20)+….=

(1)/(2.4)+(1.3)/(2.4.6)+(1.3.5.7)/(2.4.6.8*10)+.........oo is equal to

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If x = (1)/(1.2) + (1)/(3.4) + (1)/(5.6) …….oo, and y = 1 - (1)/(2.3) - (1)/(4.5) - (1)/(6.7)…….oo , then