It is known that the probability of being log on to a computer from a remote terminal
at any given time is 0.7. Let X denote the number of attempts that must be made to
gain access to the computer.
(a). Find the first four terms of the density function.
(b). Find a close form expression for f(x).
(c). Find P[X = 6].
(d). Find a close form for F(x).
(e). Use F to find the probability that at most four attempts must be made to gain
access to the computer.
