Multiple choice 81:243, 16:64, 64:192, 25:75 81:243 16:64 64:192 25:75 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The pairs follow a multiplication rule: 81*3=243, 64*3=192, 25*3=75. The pair 16:64 follows 16*4=64, making it the odd one out.