Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
COMEDK2023Evening ShiftMathematicsProbabilityActual

18 Points are indicated on the perimeter of a triangle ABC as shown below. If three points are chosen then probability that it will from a triangle is

Options

  1. A1 2
  2. B711 816
  3. C355 408
  4. D331 816

Correct answer

B. 711 816

Step-by-step solution

Total points on perimeter = 18 , with 7 points on each side (including vertices). Total ways to choose 3 points = 18 3 = 18 17 16 6 = 816 3 points are collinear (don't form a triangle) only when all 3 lie on the same side. Collinear sets per side = 7 3 = 7 6 5 6 = 35 Total collinear sets = 3 35 = 105 Favourable outcomes (triangles) = 816 - 105 = 711 Probability = 711 816

Practice Probability on Quantrex Academy →

More from Probability

Two students appeared simultaneously for an entrance exam. If the probability that the first student gets qualified in the exam is 1 4 and the probability that the second student g 2025For three events A, B and C of a sample space, P(exactly one of A or B occurs)= P ( exactly one of B or C occurs )= P ( exactly one of C or A occurs )= 1 4 . If probability of all 2025A bag P contains 4 red and 5 black balls, another bag Q contains 3 red and 6 black balls. If one ball is drawn at random from bag P and two balls are drawn from bag Q, then the pro 2025On every evening, a student either watches TV or reads a book. The probability of watching TV is 4 5 . If he watches TV, the probability that he will fall asleep is 3 4 and it is 1 2025Let X be the random variable taking values 1,2, , n for a fixed positive integer n. If P ( X = k )= 1 n for 1 k n , then the variance of X is 2025A radar system can detect an enemy plane in one out of ten consecutive scans. The probability that it can detect an enemy plane atleast twice in four consecutive scans is 2025Three numbers are chosen from 1 to 30. The probability that they are not three consecutive numbers is 2025If two events A and B are such that P ( A )=0.3, P ( B )=0.4 and P ( A B )=0.5 , then P ( B /( A B ))= 2025 Full Probability list All COMEDK PYQs