A is the average (arithmetic mean) of the first 7 positive multiples of 6 and B is the median of the first 3 positive multiples of positive integer n. If the value of A^2 – B^2 is zero, what is the value of n?	Choose the correct choice.
A) 8	B) 10	C) 12	D) 16	E) 24
If A^2 - B^2 = 0, then let's assume that A = B.   A must equal the 4th positive multiple of 4, thus A = 24, which also equals B.   B is the second positive multiple of n, thus n = 24/2= 
<gadget id="calculator">24/2</gadget>
<output>12</output>
12.   The answer is 12.
<result>C</result>
A is the average (arithmetic mean) of the first 7 positive multiples of 6 and B is the median of the first 3 positive multiples of positive integer n. If the value of A^2 – B^2 is zero, what is the value of n?