Answer: 8√2
Explanation: Use the 45-45-90 theorem to solve.
45 45 90
s s s√2
8√2 8√2 8
Each team needs two people for a 3-legged race.
Therefore, the number of orders (combinations) of 2 people at a time from 8 is
₈C₂ = 8!/(2!6!)
= (8*7*6!)/(2*6!)
= (8*7)/2
= 56/2
= 28
Answer: 28
The square root of 9 is 3
