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JOYCEVIARUIZ01IN
Answered

In a Filipino famous Patintero championship game, there are 21 matches. If each team plays one match with every other team, how many teams are there? *
A. 5
B. 6
C. 7
D. 8​

Sagot :

PIALOUISECAJALJALIN

Answer:

  • 2! =2, (n/2) = n!/(n-2!2!)

= (n-2)! n(n-1)/ (n-2)!2

= n (n-1)/2

(n-2)

(n-1)+ (n-2)+...+1=21

1+2+3+4+5+6=21

n=7

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