1.

Let A_(n)=sum_(r=1)^(n)cos^(-1).(r )/(n) and B_(n)=sum_(r=0)^(n-1)cos^(-1)((r )/(n))" for "n=1, 2, 3……., then

Answer»

`a_(2010) GT 2010`
`A_(2010) lt 2010`
`B_(2010) gt 2010`
`B_(2010) lt 2010`

Answer :C,D


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