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 21?
Choose the correct choice:
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; 21.   Then 4n &lt; 21 and n &lt; 5.25.   The largest possible integer is n = 5.   The answer is 5.
<result>E</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 21?