Question

help me with this.. proper explanation will get brainliest..

Answer 1

We know that Straight lines can be formed using 2 dots.

Given that total number of Dots = 8.

Number of ways = 8C2.

                             = 8!/2! * 6!

                             = 8 * 7 * 6 * 5 * 4 * 3 * 2/2 * 6 * 5 * 4 * 3 * 2

                             = 28.



Given that 3 points are collinear, so only 1 line is formed.

3C2 + 1.

3!/2!(3 - 2)!

3 * 2/2 * 1

3.


Therefore the number of lines = 8C2 - 3C2 + 1

                                                    = 28 - 3 + 1

                                                    = 26.



Hope this helps!

Answer 2

Hi,

Please see the attached file!



Thanks