1.

Find the sum to n terms of the series 11+ 102+1003+10004+… :

Answer»

a)`(10^N-1) + (n(n+1))/(2)`
b)`(10)/(9) (10^n -1) + (n(n+1))/(2)`
`c)10^n + n^2 -1`
d)NONE of these

Answer :B


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