From 6 positive numbers and 6 negative numbers, how many groups C of 4 numbers, yielding a positive product, can be formed?	Select: A) 720 B) 625 C) 30 D) 960 E) 255
Potential combinations of 4 numbers that will yield positive product   ++++ 4C6   ---- 4C6   ++-- 2C6*2C6   4C6 + 4C6 + 2C6*2C6   C=15 +15 + 15*15 = 255.255
<result>E</result>
From 6 positive numbers and 6 negative numbers, how many groups C of 4 numbers, yielding a positive product, can be formed?