1.

The sum of the sequence 5+55+555+… upto n terms is

Answer»

`(5)/( 9) [ ( 10 (10^(n) -1) +n) /( 9) ]`
`(5)/( 9) [ ( 10 (10^(n) -1) )/( 9) -n]`
`(5)/( 9) [ ( 10(10^(n+1) -1)) /( 9) - n]`
`(5)/( 9) [ (10(10^(n-1) -1)) /( 9) -n]`

Answer :B


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