Step-by-step explanation:
50/50 chance of choosing one or the other because there is only two options
Take to total number of people attending and subtract the number of adults. The remainder are the children
2,451 - 745 = 1,706
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Answer:
It is not a function because the output of 9 repeats.
(1,9) (4,9)
:D
Answer:
190 possibilities.
Step-by-step explanation:
The problem is called 20 choose 2, given by the formula for combinations
C(20,2) = 20! / (2! (20-2)!) = 190
alternatively, we can reason it this way:
there are 20 choices to choose a captain and 19 choices for an alternate captain for a total of 380 ways.
However, there are 20 choices to choose an alternate captain and 19 choices for a captain for a total of 380 ways.
Since we are essentially double counting every choice of the posts, we need to divide 380 by 2 to get 190 ways.
