1.

If x = 1 + 3a + 6a^2 + 10 a^3 + ……" to " oo terms |a| lt 1, y = 1+4a+10a^2 + 20a^3 + ….." to " oo terms, |a| lt 1, then x:y

Answer»

`(1 - a):1`
`1:(1 - a)`
`(1+a):1`
`1:(1+a)`

ANSWER :A


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