Question

Jackie has a drawer with 20 buttons, each of different color. How many different ways can she choose three buttons for her bookbag?

Answer 1

To find all the different possible combinations, you multiply all the possibilities for each position.

1st - she as 20 different possible buttons
2nd - she would have 19 possible buttons
3rd-she would have 18 possible buttons

20 x 19 x 18=6840 possible ways to choose these buttons.