In This Chapter
Evaluating permutations and combinations
Using the Binomial Theorem
Generating random numbers
Seeding your calculator
Do you need to calculate the number of ways you can arrange six people at a table or the number of ways you can select four people from a group of six people? Are you learning about factorials or the Binomial theorem in math class? Or do you just need an unbiased way of selecting people at random? If so, this is the chapter for you.
Did you know you can type an exclamation point on your calculator? Mathematically, the exclamation point is called a factorial. Usually students learn about factorials in pre-algebra and then forget what they are by the time they need to use factorials to solve tough probability problems. Here is a quick refresher on factorials.
4! = 4*3*2*1 and 7! = 7*6*5*4*3*2*1. See Figure 16-1. If you haven’t done so already, press `M to get to the Home screen. All the calculations in the chapter use the Home screen. Follow these steps to type a factorial in your calculator:
1. Enter the ...