Five-a-side 69434

Five children took part in the five-a-side tournament: Anka, Betka, Celeste, Dano, and Erik. Everyone played with everyone. How many games have been played?

Correct answer:

n =  10

Step-by-step explanation:

C2(5)=(25)=2!(52)!5!=2154=10  n=(25)=10

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