Choose the number pair which is different from others:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 6(12)2
In each pair, the number in brackets is the square of the first number minus the square of the second:
Option (1) 1(−63)8: \(1^2-8^2=1-64=-63\)
Option (2) 7(33)4: \(7^2-4^2=49-16=33\)
Option (3) 6(12)2: \(6^2-2^2=36-4=32\), not 12, so 6(12)2 is the odd one out
Option (4) 8(39)5: \(8^2-5^2=64-25=39\)