Question

plz... solve 25 ques

Answer 1

8C2 = 8×7/2 = 28.........

Answer 2

For the first point, you can link to 7 other points, so you have 7 chords.

For the second point, you can only link to 6 other points, as the first is linked with the second point, so you have 6 chords. And it goes on and on

So the total number of chords formed from 8 points in a circle is 7+6+5+4+3+2+1 = 28

ALTERNATE SOLUTION

$no \: of \: chords = \binom{8}{2} \\ = \frac{8 \times 7}{2} = 28$

Or you can just apply the formula to calculate no of chords
=
$\frac{n(n - 1)}{2} \: where \: n \: is \: no \: of \: points$
here \: n=8
hence
8×7/2=28