If @ is a binary operation defined as the difference between an integer n and the product of n and 5, then what is the largest positive integer n such that the outcome of the binary operation of n is less than 18?  Pick:
A) 1  B) 2  C) 3  D) 4  E) 5
@(n) = 5n - n   We need to find the largest positive integer such that 5n - n &lt; 18.   Then 4n &lt; 18 and n &lt; 4.5   The largest possible integer is n = 4.   The answer is 4.
<result>D</result>
If @ is a binary operation defined as the difference between an integer n and the product of n and 5, then what is the largest positive integer n such that the outcome of the binary operation of n is less than 18?