EduGoog
Choose or find odd number pair

(3 - 4) , (4 - 7) , (5 - 12) , (20 - 21)

Option:
A. 3 - 4
B. 4 - 7
C. 5 - 12
D. 20 - 21
Answer: D . 20 - 21

Justification: In all other pairs, one of the two numbers is prime.

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