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[" 19.If "a,b,c" are in "AP" and "a,b,d"...

[" 19.If "a,b,c" are in "AP" and "a,b,d" are in GP,show that "a,(a-b)" and "(d-c)" are "],[" in GP."],[" 20.If "a,b,c" are in "AP" ,and "a,x,b" and "b,y,c" are in GP then show that "x^(2),b^(2)" ,"y^(2)" are "],[" in "AP" ."]

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