what is the maximum number of points that 10 circles of different radii intersect ?
"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 : d"
multiply(10, const_3)