In the following question, four number pairs are given. The number on left side of (-) is related to the number of the right side of (-) with some Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.
The difference between each of the pair of numbers is 1.
But in the last option => $$21-19=2$$
Thus, (19 - 21) is the odd one out.
=> Ans - (D)
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