Total number of members = 12
Members to choose at a time = 2
This is a combination problem and we are to find the combination of 12 objects taken 2 at a time i.e. we are to find 12C2
12C2 = 66
So, there are 66 ways of selecting a president and vice president.
Therefore, the correct answer is option D
Just flip your fraction around and your answer will be 10/11
5/9-3/8+(-1/4)+1 4/9+1 5/8=3
Answer: 
Step-by-step explanation:
We have the following function:
And we have to evaluate it when 
, this means we have to substitute 
by 
:
Solving:
Finally:
Find the area of all the sides and then divide each area by two. add them all up to get your answer.
