(6 - 15) , (21 - 43) , (25 - 51) , (29 - 59) - Choose odd Number Pair / Group - Classification

Choose or find odd number pair

(6 - 15) , (21 - 43) , (25 - 51) , (29 - 59)

A. 6 - 15

B. 21 - 43

C. 25 - 51

D. 29 - 59

Answer: A . 6 - 15

Justification: In all other pairs, 2nd number = (1st number × 2) + 1