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Anonymous
The set is: 20, 24, 28.
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multiples of 3 ... 21, 24, 27, 30 (between means leave out 30 multiples of 6 ... 24, 30 so the answer is 24
They are 24 and 28.
They are 21 and 28
24, 27, 30
10 ,20 ,30 ,40 ,50