<h3>
Answer: 680 different combinations</h3>
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Explanation:
If order mattered, then we'd have 17*16*15 = 4080 different permutations. Notice how I started with 17 and counted down 1 at a a time until I had 3 slots to fill. We count down by 1 because each time we pick someone, we can't pick them again. 
So we have 4080 different ways to pick 3 people if order mattered. But again order doesn't matter. All that counts is the group itself rather than the individual or how they rank. There are 3*2*1 = 6 ways to order any group of three people, which means there are 4080/6 = 680 different combinations possible. 
An alternative is to use the nCr formula with n = 17 and r = 3. That formula is

where the exclamation marks indicate factorials
 
        
        
        
0.1875 you must divide 3 by 16 the numerator by the denominator
        
             
        
        
        
Answer:
The length of the slide he needs to make = AC = L = 14.3 ft
Step-by-step explanation:
From the Δ ABC 
AC = Length of the slide = L
AB = 9 ft
 °
 °
From  Δ ABC 

Put all the value in the above formula 


L = AC = 14.3 ft
Therefore the length of the slide he needs to make = AC = L = 14.3 ft
 
        
             
        
        
        
Answer:
I think 1 day
Step-by-step explanation:
I am not sure :)