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Choose or find odd number pair

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

Option:
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

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