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dimulka [17.4K]
3 years ago
14

There are seven shuffled question cards left in a game. Kim has to pick two of them and answer them both correctly to win. What

is the greatest number of different pairs of question cards she can pick ?
Mathematics
1 answer:
Yakvenalex [24]3 years ago
4 0
"n choose k" gives you the number of possible unique combinations...

n!/(k!(n-k)!)

n=number of elements to choose from and k=the number of elements that you choose...in this case:

7!/[2!(7-2)!]

7!/[2!5!]

21

There are 21 possible different two question combinations that she can pick.


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