Three of the following four numbers are alike in a certain way and one is different. Select the number that is different from the rest.
Answer & explanation
Correct answer: option 2
2105 ⇒ 2 - 10 - 5 = 2 × 5 → 10 = middle number
6457 ⇒ 6 - 45 - 7 = 6 × 7 → 42 ≠ middle number
4328 ⇒ 4 - 32 - 8 = 4 × 8 → 32 = middle number
3124 ⇒ 3 - 12 - 4 = 3 × 4 → 12 = middle number