Choose or find odd number pair
$(3 - 4), (4 - 7), (5 - 12), (20 - 21)$

3 - 4

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4 - 7

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5 - 12

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20 - 21

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Solution

The correct option is C $20 - 21$
In all other pairs, one of the two numbers is prime.

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-7/3*(12/5 -4/21)

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