There are 25 points on a plane of which 7 are collinear . How many quadrilaterals can be formed from these points ?

Deja Bradshaw

Deja Bradshaw

Answered question

2022-10-17

There are 25 points on a plane of which 7 are collinear . How many quadrilaterals can be formed from these points ?

Answer & Explanation

aitorarjolia

aitorarjolia

Beginner2022-10-18Added 11 answers

A quadrilateral is formed by 4 points, where at most 2 may be colinear. Thus, we have
25 C 4  choose four points 7 C 4  subtract out ways to pick four colinear points 7 C 3 18 C 1  subtract out ways to pick three colinear points

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