From Carol Ash's, "Probability Tutoring Book". pg. 28 section 1-4, question 10.
There are 50 states and 2 senators from each state. Find the prob that a committee of 15 senators contains:
a. at least 1 from each of Hawaii, Mass. and Penn.
b. at least 1 from the 3 state region composed of Hawaii, Mass. and Penn.
c. 1 from Hawaii and at least 1 from Mass.
Is my answer below correct?