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let {an},{bn},{cn} be sequences such tha...

let `{a_n},{b_n},{c_n}` be sequences such that `(1) a_n+b_n+c_n=2n+1 , (2) a_nb_n+b_nc_n+c_na_n=2n-1 , (3) a_nb_nc_n=-1 , (4) a_n < b_n < c_n` then find the value of `lim_(x->oo) (na_n)`

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