out of 25 points in a plane, no three are in a straight line except 8, which are collinear.
how many straight lines can be formed
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Answer:
18 points,5 collinear :
(a) No. of lines =
18
C
2
-
5
C
2
+ 1 = 153 - 10 + 1 = 144
(b) No. of Δ
s
=
18
C
3
-
5
C
3
= 816 - 10 = 806.
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