Question

How many volleyball games would Rana have to schedule if there were 10 teams in the league and each team played each other twice?

Answer 1

Number of games in one round
= C(10,2) = 45
but they are playing two rounds, so

total number of games = 90

Answer 2

I have no idea

Answer 3

where did you get that 10,2???? i don't get it

Answer 4

and how did you get 45???????????

Answer 5

I've got a easier way solve this question: using the table of value.
When there is 1 teams, Rana can hold 0 game;
When there is 2 teams, Rana can hold 1 game;
When there is 3 teams, Rana can hold 3 games; (Suppose there are team A, B and C, A-B, A-C, B-C, three)
When there is 4 teams, Rana can hold 6 games; (Suppose there are team A, B, C, D. A-B, A-C, A-D, B-C, B-D, C-D)
When there is 5 teams, Rana can hold 10 games;
.......
When there is 10 teams, Rana can hold 45 games.

NOTE: The players need to play with each other twice, so there will be 45*2= 90 games.

Answer 6

ur mom