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[" If "a,b,c" are in H.P.,then "(a)/(b+c...

[" If "a,b,c" are in H.P.,then "(a)/(b+c),(b)/(c+a),(c)/(a+b)" are in "],[" A "quad " A.P."],[" B "quad " G.P."],[" C "quad " H.P."],[" D "]

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