DATE: If three geometné ab, c, d are in a then at babies Ltds are in АР B 3GP (0) NOT

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( 9, b, c, d ) in GP means ( Rightarrow a_{1} b=a_{gamma}, c_{0}=a_{r}^{2}, d=a_{r}^{3} ) ( therefore a+b=a(1+r) ) ( b+c=a_{v}(1+r) ) ( c+d=a r^{2}(1+gamma) ) ( therefore a+b, b+c, c+d ) an abo m

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