MathCastle
Counting & ProbabilityChallengeProbability Fundamentals & Geometric Probability

Probability Fundamentals & Geometric Probability · Challenge problem

Three different points are chosen at random from the 1616 points of a 4×44\times4 square grid of lattice points {0,1,2,3}×{0,1,2,3}\{0,1,2,3\}\times\{0,1,2,3\}, all (163)\binom{16}{3} choices being equally likely. What is the probability that the three points lie on a line? Express your answer as a common fraction.