Circles

How many different circles are determined by 9 points at the plane if 6 of them lie in a straight line?

Correct answer:

n =  64

Step-by-step explanation:

n1=C3(9)=(39)=3!(93)!9!=321987=84 n2=C3(6)=(36)=3!(63)!6!=321654=20 n=n1n2=8420=64



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