There are 81 grid points (uniformly spaced) in the square shown in the diagram below, including the points on the edges. Point P is in the center of the square. Given that point Q is randomly chosen among the other 80 points, what is the probability that the line PQ is a line of symmetry for the square?

# How many ways – Probability Math Puzzles

Math Topic: Logic, Probability

Grade: 6, 7, 8