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Suppose a,d in (0,oo) and an =a+ (n-1)d ...

Suppose `a,d in (0,oo) and a_n =a+ (n-1)d AA n in N`. Least value of `sum_(k=1)^n sqrt(a_k^2-a_k a_(k+1)+a_(k+1)^2)` is

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