Question 631228
List the positive multiples of 4 (up to 50)


4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48


Then list the positive multiples of 6 (up to 50)


6, 12, 18, 24, 30, 36, 42, 48


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So go through the first list and erase any elements in that first list that also lie in the second list.


So start with the first list 


4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48


and scratch off any numbers you find in the second list (numbers like 12, 24, 36, etc)


4, 8, <s><font color="red">12</font></s>, 16, 20, <s><font color="red">24</font></s>, 28, 32, <s><font color="red">36</font></s>, 40, 44, <s><font color="red">48</font></s>


What's left is the following


4, 8, 16, 20, 28, 32, 40, 44


So there are <font color="red">8</font> positive integers less than 50 that are multiples of 4 but are not multiples of 6.


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