1) If A:B:C=2:3:4, then AB:BC:CA is equal to : A) 5:4:11 B) 7:11:32 C) 1:4:9 D) 8:9:24 E) 7:11:9 Answer: Option DExplanation:Let A=2x, B=3x and C=4x. Then, AB =2x3x =23, BC =3x4x =34 and CA =4x2x =21 (AB):(BC):(CA) =(23):(34):(21) =8:9:24