1.

1+ ((1)/(3) + (1)/(3^2) ) + (( 1)/( 3^3) + (1)/( 3^4)+ (1)/( 3^5) ) + .... sum of the termsin the n^( th) bracket=

Answer»

`((3n-1)^(3) )/( 2.4^(n-1) )`
`(3n-1)/( 2.3^( (n-1) (n+2) //2) )`
`(3^n +1)/( 3.7^(n-1) ) `
`(3^(n -1) )/( 2^(n+1) )`

Answer :B


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