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Write the value of lim(n->oo)(1+2+3++n)/...

Write the value of `lim_(n->oo)(1+2+3++n)/(n^2)\ `

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`lim_(n->oo)(1+2+3++n)/(n^2)`
`=lim_(n->oo)(n(n+1))/(2n^2)`
`=lim_(n->oo)(n^2(1+1/n))/(2n^2)`
`=lim_(n->oo)(1+1/n)/(2)`
`=1/2`
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