Three of the following four numbers are alike in a certain way and one is different. Choose the number that does not belong to the group.
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 6422
Multiply the first two digits of each number and compare the product with the number formed by the last two digits.
Option (1) 7856 — \( 7 \times 8 = 56 \) = last two digits 56: matches.
Option (2) 7214 — \( 7 \times 2 = 14 \) = last two digits 14: matches.
Option (3) 6848 — \( 6 \times 8 = 48 \) = last two digits 48: matches.
Option (4) 6422 — \( 6 \times 4 = 24 \), but the last two digits are 22: does not match.
In 7856, 7214 and 6848 the last two digits are the product of the first two; 6422 does not follow this, so 6422 is the odd one out.