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b,a,d,c,...,x,y are an Arithmetic sequence and all of them are Positive so prove this phrase?

b,a,d,c,...,x,y (they are n numbers and n is Subset of set of natural numbers) are an Arithmetic sequence and all of them are Positive so prove this phrase

(1/(√b+√a))+(1/(√d+√c))+...+(1/(√x+√y))=(n-1)/(√b+√y)

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