I need to solve these problems and know how to solve them . Thank you.

Review Exercises 1. Selecting Masks How many ways are there to select 3 masks from a box of 10 masks, disregarding the order of selection? 2. Selecting Players How many ways can 4 baseball players and 3 basketball players be selected from 12 baseball players and 9 basketball players? 3. Selecting Graduation Presents If a person can select 3 presents from 10 presents, how many different combinations are there? 4. Questions for a Test How many different tests can be made from a test bank of 20 questions if the test consists of 5 questions? 5. Freight Train Cars In a train yard there are 4 tank cars, 12 boxcars, and 7 flatcars. How many ways can a train be made up consisting of 2 tank cars, 5 boxcars, and 3 flatcars? (In this case, order is not important.) 6. Selecting a Committee There are 7 women and 5 men in a department. How many ways can a committee of 4 people be selected? How many ways can this committee be selected if there must be 2 men and 2 women on the committee? How many ways can this committee be selected if there must be at least 2 women on the committee? 7. Dinner Selections How many ways can a dinner patron select 3 appetizers and 2 vegetables if there are 6 appetizers and 5 vegetables on the menu? 8. DVD Selection How many ways can a person select 8 DVDs from a display of 13 DVDs? 9. Selecting Commercials How many ways can a person select 7 television commercials from 11 television commercials? 10. Selecting a Golf Foursome How many ways can a foursome of 2 men and 2 women be selected from 10 men and 12 women in a golf club? 11. How many 4 - member committees with 2 of a certain gender and 2 of another gender, can be selected at random from a group of 10 men and 9 women? 12. How many 8 - member committees with at least 3 women, can be selected at random from a group of 8 men and 9 women