There are different 5 circles. What is the number of the greatest possible points with which the circles intersect?
Choose the correct option
A) 20
B) 10
C) 15
D) 22
E) 21
Maximum points of intersection between n different circles = n*(n - 1) = 5*4= 
<gadget id="calculator">5*4</gadget>
<output>20</output>
20   20nswer: 20
<result>A</result>
There are different 5 circles. What is the number of the greatest possible points with which the circles intersect?