Here's a rule of thumb that works for these probability questions. Let say there are 5 objects and you can 3 of them. Then the total number of ways are: 5x4x3=60 This is because at the beginning there are 5 objects to choose from, after one is chosen, there's only 4 left. After another one is chosen, there is only 3 left. That's when you are done with your 3 turns to choose. I am a bit busy and I will tell you later
