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[" 20.If "a,b,c" are in arithmetic progr...

[" 20.If "a,b,c" are in arithmetic progression,then "],[(1)/(sqrt(a)+sqrt(b)),(1)/(sqrt(a)+sqrt(c))*(1)/(sqrt(b)+sqrt(c))" are in "],[[" (a) "AP" ."," (b) G."],[" (6) HP."," (d) None of these "]]

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