Combinations

Transcript

Combinations3 servings of Ice-cream, we need only 2 How many ways can we choose 2 servings out of 3 ice creams And we have 6 choices How can we calculate this? If we choose first as brown, we have two choices Similarly, if we choose first as pink, we have two choices and, if we choose first as green, we have two choices Thus, Total cones = 2 + 2 + 2 = 6 Now, let’s take an example from the book 4 Dress and 3 Caps Example Estu has 4 dresses and 3 caps. How many different ways can Estu combine the dresses and caps? Let’s figure out all possible combinations Thus, there are 12 possible options We can also write it as Total options = Number of hats × Number of dress = 3 × 4 = 12 Now, lets do a question from the book