Matches of Football
Number Theory
Level
2
There are 21 football team in a nations league. How many football matches are there altogether throughout the league?
( Note :Every team must play every other team twice.)
500
315
474
210
420
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1 solution
420 because it is 20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1= 210 * 2 = 420