16. Customer account "numbers" for a certain company consist of 3 letters followed by 3 numbers.

Step 2 of 2:

How many different account numbers are possible if repetitions of letters and digits are not allowed?

17. Determine if the following events are independent.

Going to the gym. Losing weight.

A. independent

b. Dependent

18. A box contains 13 large marbles and 20 small marbles. Each marble is either green or white. 5 of the large marbles are green, and 13 of the small marbles are white. If a marble is randomly selected from the box, what is the probability that it is small or green? Express your answer as a fraction or a decimal number rounded to four decimal places.