What is the probability that a new hire at Trojan Consulting will become a partner (as opposed to being dismissed after 5 years (associate years) or 9 years (associate manager years))?

a) (P(partner))
b) (P(dismissed after 5 years))
c) (P(dismissed after 9 years))
d) (1 - [P(dismissed after 5 years) + P(dismissed after 9 years)])