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[qquad [c!=0],[12." If "a^(2)(b+c),b^(2)...

[qquad [c!=0],[12." If "a^(2)(b+c),b^(2)(c+a),c^(2)(a+b)" are in A.P.show that either "],[a,b,c" are in "A.P." or "ab+bc+ca=0]]

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