In how many different ways can four people: Ali, Naser, Jassim, and Mohammed, sit in a...

 

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In how many different ways can four people: Ali, Naser, Jassim, and Mohammed, sit in a row in a theater if Ali and Mohammed must sit beside each other? In how many different ways can four people: Ali, Naser, Jassim, and Mohammed, sit in a row in a theater if Ali and Mohammed must sit beside each other?

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