1.

Sum ton terms of the series 1+ (1+x)+ (1+ x+x^(2) ) + ( 1+ x+x^(2) + x^(3) ) + …....

Answer»

`(N)/( 1-X) -(x (1-x^(n) ))/( (1-x)^(2) )`
`(n)/( 1-x)+ (x ( 1-x^(n) ))/( (1-x)^2)`
`(n)/( 1-x) + ( x(1+x^(n) ))/( (1-x)^2)`
`(-n)/( 1-x) + ( x (1-x^n))/( (1-x)^2)`

ANSWER :A


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