7. a) Compute 5C2 using the factorial formula. b) Compute 5C2 "by hand," using the 5 letters ABCDE and writing down all the possible ways to choose 2 of those letters. The total number of two letter...

Extracted text: 7. a) Compute 5C2 using the factorial formula. b) Compute 5C2 "by hand," using the 5 letters ABCDE and writing down all the possible ways to choose 2 of those letters. The total number of two letter combinations will equal the value you found in part (a).