Probability (P) is basically outcome, and chance. What are the chances of grabbing a red or blue marble? Well, there IS a more complicated way to solve this, but let's go the easy way. You calculate probability with this equation: Probability=Events/Number of outcomes If you want to find the probability of grabbing a red or blue marble, you first have to find all possible outcomes by adding ALL numbers together. 6+6+4=16. Next, find how many events you have. Well, you want to find red or blue. Add the number of red and blue marbles together. 6+4=10, so your equation now looks like: Probability=10/16 Now, just simplify. 10/16 can be divided evenly by 2 on both sides, so just do that, and you get: 5/8 You have a 5/8 chance, or a 0.625 chance of drawing a red or blue marble.
