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There are 5 featured speakers at a conference, including Marc and his sister Anna. In how...

There are 5 featured speakers at a conference, including Marc and his sister Anna. In how many ways can Marc and Anna open and/or close the conference

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Answer #1

Marc and Anna can be arrange in 2! ways

and remaining 3 speakers can be arrange in 3! ways

Hence, total possible ways = 2! * 3! = 2 * 6 = 12

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