(24 - 21) , (46 - 32) , (62 - 23) , (84 - 24)
Option:
Justification: In all other pairs, the first number is obtained by multiplying the second number by 2 and then reversing the digits of the number so obtained.

(24 - 21) , (46 - 32) , (62 - 23) , (84 - 24)
Justification: In all other pairs, the first number is obtained by multiplying the second number by 2 and then reversing the digits of the number so obtained.