10. It is known that the probability of being able to log on to a computer from a re- mote terminal at any given time is .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 table. (b) Find a closed-form expression for f(x). (c) Find P[X = 6]. (d) Find a closed-form expression for F(x). (e) Use F to find the probability that at most four attempts must be made to gain access to the computer.

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