A stereo store is offering a special price on a complete set

A stereo store is offering a special price on a complete set of components (receiver, compact disc player, speakers, turntable). A purchaser is offered a choice of manufacturer for each component:
Receiver: Kenwood, Onkyo, Sony, Sherwood
Compact disc player: Onkyo, Pioneer, Sony, Technics
Speakers: Boston, Infinity, Polk
Turntable: Onkyo, Sony, Teac, Technics
A switchboard display in the store allows a customer to hook together any selection of components (consisting of one of each type). Use the product rules to answer the following questions:
(a) In how many ways can one component of each type be selected?
ways

(b) In how many ways can components be selected if both the receiver and the compact disc player are to be Sony?
ways

(c) In how many ways can components be selected if none is to be Sony?
ways

(d) In how many ways can a selection be made if at least one Sony component is to be included?
ways

(e) If someone flips switches on the selection in a completely random fashion, what is the probability that the system selected contains at least one Sony component? Exactly one Sony component? (Round your answer to three decimal places.)
at least one Sony component         
exactly one Sony component      

Solution

a)

(4 receivers)(4 cd player)(3 speakers)(4 turntable) = 192 ways [answer]

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b)

(1 sony receiver)(1 sonr cd player)(3 spk)(4 turn) = 12 ways [answer]

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c)

(3 not sony receiver)(3 not sony cd player)(3 spk)(3 not sony turn) = 81 ways [answer]

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