A jar contains 5 red marbles and 5 blue marbles. The probability of drawing a red marble would be:
Favorable: 5 (red marbles), Total: 10 (total marbles) → Probability = 0.5 (50%)
How many ways can you choose 3 people from a group of 10 where order doesn't matter?
n = 10, r = 3 → 120 possible combinations
How many ways can 5 runners finish 1st, 2nd, and 3rd (order matters)?
n = 5, r = 3 → 60 possible permutations