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" 42."1-(1)/(5)+(1.4)/(5.10)-(1.4.7)/(5....

" 42."1-(1)/(5)+(1.4)/(5.10)-(1.4.7)/(5.10.15)+.....oo

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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)+…..=

If x=(1)/(5)+(1.3)/(5.10)+(1.3.5)/(5.10.15)+….oo then find 3x^(2)+6x.

If x=(1)/(5)+(1.3)/(5.10)+(1.3.5)/(5.10.15)+….oo then find 3x^(2)+6x.

If [t=(4)/(5)+(4.6)/(5.10)+(4.6.8)/(5.10.15)+....oo], then the value of 9t= .....

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

Find the sum of the infinite series 1-(4)/(5)+(4.7)/(5.10)-(4.7.10)/(5.10.15)+………

If t=(4)/(5)+(4.6)/(5.10)+(4.6.8)/(5.10.15)+………oo then prove that 9t=16.

If t = 4/5 + (4.6)/(5.10) + (4.6.8)/(5.10.15) + ……oo then prove that 9t = 16