That could be a trick question. There is one integer that comes between 4 and 6, which of course is 5. There are also infinitely many fractions, such as 4.2, 4.25, and so forth.
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The answer is a set of the form {4, 4, 6, n, 12} where n is any number between 6 and 12.The answer is a set of the form {4, 4, 6, n, 12} where n is any number between 6 and 12.The answer is a set of the form {4, 4, 6, n, 12} where n is any number between 6 and 12.The answer is a set of the form {4, 4, 6, n, 12} where n is any number between 6 and 12.
5
11 comes next.
The average of 8 and 4 would be 6 (8+4)/2=6
18. 3+1=4, 4+2=6, 6+3=9, 9+4=13, 13+5=18.