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[" (a) "AP],[" 9.If "(x+y)/(2),y,(y+z)/(...

[" (a) "AP],[" 9.If "(x+y)/(2),y,(y+z)/(2)" are in "HP" ,then "x,y,z" are in "],[[" (a) "AP," (b) "GP," 1"," (b) "" are in "]]

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