From 5 positive numbers and 5 negative numbers, how many groups of 4 numbers, yielding a positive product, can be formed? Choose the correct choice from the following answers:
A) 720
B) 110
C) 30
D) 960
E) 255
The number of ways to choose 4 positive numbers is 5C4 = 5.   The number of ways to choose 4 negative numbers is 5C4 = 5.   The number of ways to choose 2 positive and 2 negative is 5C2*5C2 = 10*10= 
<gadget id="calculator">10*10</gadget>
<output>100</output>
100.   The total number of groups is 5+5+100= 
<gadget id="calculator">5+5+100</gadget>
<output>110</output>
110.   The answer is 110.
<result>B</result>
From 5 positive numbers and 5 negative numbers, how many groups of 4 numbers, yielding a positive product, can be formed?