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If x=(1)/(5)+(1.3)/(5.10)+(1.3.5)/(5.10....

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

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The correct Answer is:
`=>3x^(2)+6x=2`
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