Suppose the probability density function of X, the lifetime of your professor's computer (measured in years), is given by fX​(x). What is the probability that the computer will last exactly 5 years?
Write a formal description of the following sets:

A) Set A contains all even numbers between 1 and 10.
B) Set B includes all prime numbers less than 20.
C) Set C consists of all multiples of 5 from 1 to 30.
D) Set D contains all integers between -5 and 5.