1.

Which of the following is an arithmetico geometric series ?

Answer»

`1+3x+7x^2+15x^3+….`
`X+1/2x+1/3x^2+....`
`x+(1+2)x^2+(1+2+3)x^3+...`
`x+3x^2+5x^3+7x^4+...`

ANSWER :A::B::C::D


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