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Henrick got a total of 5 birthday presents from his 5 siblings — Holly, Hugh, Hilda,Howard, and Harry — and he decided to unwrap one present per day in the next fewdays, starting today with Harry’s gift (because it is perishable). How many possible sequences of unwrapping are there?

 Feb 6, 2021
 #1
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Opens 1    4 left

    4 choices then

         3 choices

            then 2 choices      4 * 3 * 2 = 24 ways to open the remaining pax

 Feb 6, 2021
 #2
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I think this is the Answer:

 

So the first one is Harry, so the first choice has one option (1)

 

The second one has 4 options because Harry was already chosen  (4)

 

The third one has 3 options because 2 of them were already chosen (3)

 

The fourth one has 2 options because 3 of them were already chosen (2)

 

And one of them will be the last one; there is one option. (1)

 

So, 1*4*3*2*1=24

 Feb 9, 2021

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