16, 32 and 48
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The set of numbers which 3 does not belong is the set of even numbers.
67
The lowest common denominator of any set of whole numbers is 1
The numbers are: 3 and 16 because 3*16 = 48 and 3+16 = 19
Counting up from 1, there is a number divisible by 3 every 3 numbers. Thus to find out how many numbers are divisible by 3, we just have to divide the number we're counting to by 3. In this case, the top number is 50, so do: 50/3 = 16 with two remainder. Because the numbers divisible by 3 come last in every set of 3 numbers, we can discard the remainder. Therefore there are 16 numbers between 1 and 50 that are divisible by 3.