Question 137022
n how many ways can Al, Bob, Carlos, Don, Ed, and Fern be seated in a row of six seats if Al and Bob are not to be seated side by side? [Hint: Either Al and Bob will be seated side by side or they will not be seated side by side.]
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# of ways of unrestricted ways: 6! = 720
# of ways if Al and Bob sit side by side: 5!=120
# of ways if Al and Bob do not sit side by side: 720-120= 600 ways
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Cheers,
Stan H.