All Questions
Lê Quốc Trần Anh Coodinator
08/07/2018 at 06:18
Nguyễn Mạnh Hùng 09/07/2018 at 09:17
Call the number of teams is n
We have: The number of games is n(n+1) games
But each game repeated 2 times
So the number of the games is \(\dfrac{n\left(n+1\right)}{2}\)
There are 21 games
So \(\dfrac{n\left(n+1\right)}{2}=21\Rightarrow n\left(n+1\right)=42\Rightarrow n=6\)
Lê Quốc Trần Anh selected this answer.
Lê Quốc Trần Anh Coodinator
08/07/2018 at 06:17Lê Quốc Trần Anh Coodinator
08/07/2018 at 06:17Lê Quốc Trần Anh Coodinator
08/07/2018 at 06:16Lê Quốc Trần Anh Coodinator
08/07/2018 at 06:16Lê Quốc Trần Anh Coodinator
08/07/2018 at 06:15Huỳnh Anh Phương
08/07/2018 at 03:24
Nguyễn Mạnh Hùng 10/07/2018 at 01:18
#35# = 35 x 1 x 2 x 3 = 35 x 6 = 210
Huỳnh Anh Phương selected this answer.

Huỳnh Anh Phương 08/07/2018 at 03:18
@3@=6x3x2x1=36

Huỳnh Anh Phương 09/07/2018 at 03:46
that be answered !
Lê Quốc Trần Anh Coodinator
07/06/2018 at 02:544150
questionsWeekly ranking
Tags
games 18
double counting 6
generating functions 2
probabilistic method 1
Polynomial 5
inequality 11
area 9
Equation 7
Primitive Roots Modulo Primes 1
Primitive in Arithmetic Progression 6
Base n Representatioons 4
Pell Equation 1
mixed number 1
Fraction 28
Circle 2
Imaginary numbers 1
Decimal number 2
Volume 2
percentages 6
simple equation 19
absolute value 19
rational numbers 20
Operation of Indices 21
Simulataneous Equation A System of Equations 25
Multiplication of Polynomial 17
divisibility 23
Maximum 4
Minimum 2
Fraction 2
Prime Numbers and Composite Numbers 13
Square Number 26
Even and Odd Numbers 13
GDC and LCM 11
GCD and LCM 12
Permutation and combination 8
combinations 4
interger 7
number 9
Diophantine equations 2
equations 1
Grade 6 19
Power 3
equality 2
maximaminima 2
square root 1
Polygon 1
IGCSE 1