17. The probability that Tom will be alive in 20 years is 0.7, and the probability that Nancy will be alive in 20 years is 0.9. If we assume independence for both, what is the probability that at...

17. The probability that Tom will be alive in 20 years is 0.7, and the probability that Nancy will be alive in 20 years is 0.9. If we assume independence for both, what is the probability that at least one of them will be alive in 20 years?

18. What is the probability that Bassam, his wife Sandra, and their two children Hady and Ziad all have birthdays

a) During February?                                             b) during the same month?