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If x=(1.3)/(3.6)+(1.3.5)/(3.6.9)+(1.3.5....

If `x=(1.3)/(3.6)+(1.3.5)/(3.6.9)+(1.3.5.7)/(3.6.9.12)+....` then prove that `9x^(2)+24x=11`.

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The correct Answer is:
`=11`
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