Three of the following four number pairs are alike in a certain way and one is different. Find the odd one out.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 29 : 812
In three of the pairs the second number is the first multiplied by the next number: 17 × 18 = 306, 16 × 17 = 272 and 22 × 23 = 506.
For 29 the same rule would give 29 × 30 = 870, but the pair shows 812, which is 29 × 28 — the preceding number. So 29 : 812 is the odd one out.