1.

lim_(Nrarroo) sum_(r=1)^n (2r-1)/2^ris equal to :-

Answer»

1
`3/2`
3
6

Solution :`S=1/2+3/2^2 + 5/2^3 + ….OO`
`S/2=1/2^2+3/2^3 + …… oo`
`S/2=1/2+2(1/2^2+1/2^3+….oo)`
`=1/2+1/2 2 RARR S=3`


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