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If x,a1,a2,a3,…..an epsilon R and (x-a1+...

If` x,a_1,a_2,a_3,…..a_n epsilon R` and `(x-a_1+a_2)^2+(x-a_2+a_3)^2+…….+(x-a_(n-1)+a_n)^2le0`, then `a_1,a_2,a_3………a_n` are in (A) AP (B) GP (C) HP (D) none of these

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