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

[" 1.If "a.b,c" are in "AP" and "b" ,"c,d" be in HP.then "],[[" (a) "ab=c sigma," (b) "ad=bc," (c) "8c=bd," (d) abco "=1]]

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