Which of those sets is not binary

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Which of those sets is not binary Answer: 50.40,30,20,10

The set containing 50.40, 30, 20, 10 is not a binary set because a binary set, or binary number, can only contain the digits (0) and (1). The other two sets, {0,1,0,0,0,1} and {1,0,1,1,0,0,0,1}, are valid binary sets.