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is it none of these cuz max no circles can be drawn from any two points

you left out some details. are the points the center, or do they lie on the circumference?

that info is not given

In that case, I have no idea.

btw 20C1*20C2+20C2*20C1=900 is given correct

I guess they don't explain that ?

no

maybe someone else will have some insight on this one.

btw, 20C1*20C2+20C2*20C1 would work out to
20*190 + 190*20
that is not 900

btw book has many typos in the past

sry it is 10C1*10C2+10C2*10C1=900

it sounds like they want the circle to go through 3 points

i want to make sure if the 2 points circle is not what they want

ok thnks

u mean it should be \(900+10C3\)

yes, unless you insist the circle must contain a point on the line.

ok i assume ur answer is correct then