Select the option in which the numbers share the same relationship as that shared by the given pair of numbers. 42 : 18

71 : 45 19 : 5 31 : 29 10 : 9

10 : 9

THE LOGIC FOLLOWED HERE IS : 42  -  18 = 24 IF WE INTERCHANGE UNIT DIGITS AND TEN'S DIGIT THE WE OBTAIN 42 , WHICH IS FIRST TERM OF ANALOGY SIMILARLY 10 - 9 = 01 IF WE INTERCHANGE UNIT DIGITS AND TEN'S DIGIT THE WE OBTAIN 10 , WHICH IS FIRST TERM OF ANALOGY