Question

there are 30 points on a plane out of which 10 are on a straight line 8 are on the second straight line and 18 are on the third straight line analyze the given data and determine the number of ways in which traingle can be drawn by joining the points from the given 30 point's​

Answer 1

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.