Question

( 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

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

Solution