Please help if you can How many ways can we choose three ite

Please help if you can!

How many ways can we choose three items at random without replacement from five items (A, B, C, D, E) if the order of the selected items is not important? 24 60 120 10

Solution

If the order of selected items is not important, we use COMBINATION formula

For selecting 3 items out of 5:

5C3 = 5! / (3! * (5-3)!) = 5! / (3! * 2!) = 120 / (6*2) = 10

Answer: 10