Jack is picking out some movies to rent, and he is primarily interested in mysteries and foreign films. He has narrowed down his selections to 20 mysteries and 10 foreign films. Step 1 of 2 : How many different combinations of 4 movies can he rent?

Which of the following are independent events? a) knowing that it is going to rain tomorrow, and bringing an umbrella to schoolb) knowing that you have to get up early tomorrow, and going to bed before 9 p.mc) knowing that it is going to rain tomorrow, and going to bed before 9 p.md) knowing that you have a test in school tomorrow, and studying thw night before