29 because it's the only Prime number in the set. It has only two factors, itself and one.
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14832
-4.2 is a negative decimal number. It is also a directed number.
I would say that 4 doesn't belong because it is not a multiple of 3.
Since there is only one number given, it is not possible to determine the criterion for inclusion. So there cannot be an answer.
1/2 is a rational number