`(a)/(B + C - a) , (b)/(c + a - b), (c)/(a + b - c)` are in H.P.`(2)/(b) = (1)/(b-a) + (1)/(b-c)``a - (b)/(2),(b)/(2) , c (b)/(2) ` are in G.P.`(a)/(b+c),(b)/(c+a),(c)/(a +b)` are in H.P.
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