Use the following for the questions below
A sample of 4 people is selected from a group of six people named Ali, Bina, Chris, David, Erin and Frank.
1. How many such samples are possible?
2. What is the probability a sample containing Bina and Chris is selected.
3. How many different simple random samples of size 8 can be selected from a population consisting of 70 people? (you may use the combinations)