1.

If x = (2)/(5) + (1.3)/(2!)((2)/(5))^(2) + (1.3.5)/(3!)((2)/(5))^(3) +…, then x + (1)/(x) =

Answer»

`(1+sqrt(5))/(4)`
3
`(5sqrt(5) + 3)/(4)`
`(5sqrt(5) - 3)/(4)`

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