# Binomial Distribution

1. Nov 7, 2012

### domyy

1. The problem statement, all variables and given/known data

Hello, I am trying to calculate the following:

15!/(1!)(14!) x (0.80)^14 x (0.2)^1

I understand the problem as I have already put the numbers together. My trouble is actually using the calculator to find the answer. When I try to find 15! = 1.307674368^12

The answer for the problem should be 0.132.

2. Nov 7, 2012

### haruspex

Using the calculator that way might go wrong if the numbers get too big for the calculator to maintain 100% accuracy. There really is no need to calculate 15!. There's an easy simplification available.

3. Nov 7, 2012

### domyy

But there's answer available for the problem. My answer at first was 0.00132.

But it should be 0.132

Last edited: Nov 7, 2012
4. Nov 7, 2012

### LCKurtz

Without your calculator, on a sheet of paper write down $\frac{15!}{14!}$ writing out the factorials. It simplifies.

5. Nov 7, 2012

### domyy

THANKS!! Now, I got the right answer!