Student: There are different 15 circles. What is the number of the greatest possible points with which the circles intersect?\nOptions:\n(A) 390\n(B) 100\n(C) 110\n(D) 180\n(E) 210.
Another student: Let's say, hmmm...

User
Maximum points of intersection between n different circles = n*(n - 1) = 15*14 = 210 Final answer: (E).
Assistant