Select the one which is different from the other three alternatives:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 9, 64
Option (1) 7, 56 — \(56=7\times8\), a multiple of 7.
Option (2) 13, 78 — \(78=13\times6\), a multiple of 13.
Option (3) 9, 64 — \(9\times7=63\), so 64 leaves a remainder of 1 and is not a multiple of 9. In every other pair the second number is a multiple of the first, so 9, 64 is the odd one out.
Option (4) 11, 132 — \(132=11\times12\), a multiple of 11.