Quant

the number of circles can be drawn out of 10 points of which 7 are collinear will be:-
1)120
2)113
3)85
4)86

sol>

3 non collinear then =>3C3

1 collinear , 2 non then=> 7C1*3C2

2 co and 1 noncollinear then=>7C2*3C1

sum of all are 85