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Choose or find odd number pair

(46 - 10) , (42 - 33) , (20 - 38) , (12 - 91)

Option:
A. 46 - 10
B. 42 - 33
C. 20 - 38
D. 12 - 91
Answer: D . 12 - 91

Justification: In all other pairs, the different between the two numbers is a multiple of 9.

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