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) → 152
Divide each number by 7.
Option (1) 476 — \( 476 = 7 \times 68 \): a multiple of 7.
Option (2) 217 — \( 217 = 7 \times 31 \): a multiple of 7.
Option (3) 427 — \( 427 = 7 \times 61 \): a multiple of 7.
Option (4) 152 — \( 152 = 7 \times 21 + 5 \): leaves remainder 5, so it is not a multiple of 7.
476, 217 and 427 are multiples of 7; 152 is not, so 152 is the odd one out.