Question

how many ways can 3 students be chosen from a class of 20 to represent their class at a banquet?

Answer 1

60 ways because the easy way to solve this problem is identify the numbers being used and than multiply them by each other.

Answer 2

Slot method 20 options 3 slots First slot: 20 options Second slot: 19 options (one used up for 1st slot) Third slot: 18 (one less than last) Multiply them 20 times 19 times 18=6840 Answer is 6840 ways