1. In how many ways could a committee of 3 or 4 people be formed from a staff of 15. I got the answer for this which is 1820 ways, but then it asks another question later on. For the situation of Exercise 17, what is the probability that Henri, Marcy, and Jorge are all on the committee? 2. n!/r!(n-r)! 3. 3!/1820 + 2!/1820 + 1!/1820 = 9/1820 but my answer is wrong it should be 13/1820. How do you do this problem? 2nd question 1. Two cards are drawn in succession from an ordinary deck. The first is not replaced before the second drawn. Find the probability of each event. Both are red hearts 2. no needed formulas 3. 26/52 * 25/51 = 650/7652 = 325/3826 but my answer is wrong it should be 25/102. How do you do this problem? Thank You!