In an office, there are 2 secretaries. The probability that secretary 1 is

present in any given day is 92% while the probability that secretary 2 is

present in any given day is 98%. The probability that both will be present in a

given day is 91%.

So, in a given day, what is the probability that:

(a.). either secretary 1 or secretary 2 is present

(b.). neither secretary 1 nor secretary 2 is present

(c.). only secretary 1 is present

(d.). a secretary is not available to do a job

(e.). exactly one secretary is absent