Question

There are 16 points in a plane of which 7 are in a straight line. Then how many straight lines can be formed?
125
100
200
150​

Answer 1

Answer: 100

Step-by-step explanation:

• 7 points lie in straight line so only one line can be formed through 7 points.
• So,total lines that can be formed through 16 points=¹⁶C₂ - ⁷C₂

                                                                                                 =15×8-21

                                                                                                 =99

• Total lines =99+1=100
• Hence,100 lines can be formed.