Answer:
720
Step-by-step explanation:
you see, 3 x 2 x 1 = 6 possible ways of arranging the three people . Therefore in that set of 720 possibilities, each unique combination of three people is represented 6 times. So we just divide by 6.
The distance between two points can be calculated using the formula;
Given the two points;
Substituting the coordinates, we have;
For the second point;
Substituting the coordinateswe have;
Therefore;
Here, we have to add Nan's tiles to Sato's tile usage, which is half of Nan's.
We can solve this expression:
30 + 30 (0.5)
30 + 15
= 45
Therefore, both used a total of 45 tiles! :)