Ronnie is scheduling a chess tournament in which each player plays every other player once. He created a table and found that each new player adds more games to the tournament in an arithmetic sequence. Answer this set of project questions regarding the chess games.

Table:
# of players | # of games
1 | 0
2 | 1
3 | 3
4 | 6
5 | 10

Select an explicit rule for the sequence of tournament games.
a) an= n^2-n/2
b) an= n^2/2 +n
c) an= (n-1)(n=1)
d) an= n-1/2

Question

Ronnie is scheduling a chess tournament in which each player plays every other player once. He created a table and found that each new player adds more games to the tournament in an arithmetic sequence. Answer this set of project questions regarding the chess games.

Table:
# of players | # of games
1 | 0
2 | 1
3 | 3
4 | 6
5 | 10

 Select an explicit rule for the sequence of tournament games.
a) an= n^2-n/2
b) an= n^2/2 +n
c) an= (n-1)(n=1)
d) an= n-1/2