Most Important Selected Qs for JEE AdvancedMathematicsPermutation and Combination
Paragraph: Consider the following set of points in the x-y plane A= (a, b) a, b I and |a|+|b| 2 . Question: The number of straight line which pass through at least 2 points in A , is:
Options
- A20
- B22
- C32
- D40
Correct answer
D. 40
Step-by-step solution
(i) Number of lines = ¹³ C₂- ^3 C₂ 10-2 ^5 C₂+12=40 (ii) ¹³ C₃-10- ^5 C₃ 2=256