Refer to Exercise 3. Resistors are randomly selected from the box, one by one, until a 100? resistor is selected.
a. What is the probability that the first two resistors are both 50??
b. What is the probability that a total of two resistors are selected from the box?
c. What is the probability that more than three resistors are selected from the box?
(a) (10?15)(9?14) = 3?7
(b) P(2 resistors selected)=P(1st is 50? and 2nd is 100?)
=(10?15)(5?14)
=5?21
(c) P(more than 3 resistors selected)=P(1st 3 resistors are all 50?)
=(10?15)(9?14)(8?13)
=24?91
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