Three women who have been friends since childhood have just graduated from college. The friends are very

Question:

Three women who have been friends since childhood have just graduated from college. The friends are very different, and have different abilities and skills. All three of them are trying to get jobs in the financial services industry. Their probabilities of succeeding are 0.4, 0.5, and 0.35. Find the probability that
a. All of them succeed
b. None of them succeeds
c. At least one of them succeeds