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.
It’s pretty much where part of the number is repeated. For example, 0.0087878787 (87 is repeated) or 0.0567567567 (567 is repeated)
Answer:
p = 36cm
Step-by-step explanation:
p = 4a
4 × 9 = 36
<em>good luck, i hope this helps :)
</em>
<em />
Answer:
x=133
Step-by-step explanation:
the missing angle plus are supplementary. the missing angle is 47 as a triangle must be 180 degrees.
therefore 180=x+47
