What is the maximum number of points that 10 circles of different radii intersect?
Choose the correct choice.
A) 24	B) 26	C) 33	D) 90	E) 100
the maximum number of points that two circles intersect is two.   therefore, each of these 10 circles intersect two point with each of the other 9 circles.   as a consequence, the number of these points is equal to two times the number of combination of the 10 circles.   2∗(10!)/(2!∗10!)=90   Answer: 90
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What is the maximum number of points that 10 circles of different radii intersect?