In a tournament of 7 players, each player plays every other player once. How many matches are there?
21
In a round-robin tournament with n players, the number of matches is the number of ways to choose 2 players out of n, i.e. \(\binom{n}{2} = \dfrac{n(n-1)}{2}\).
For n = 7: \(\dfrac{7 \times 6}{2} = \dfrac{42}{2} = 21\).
Hence, there are 21 matches.
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Important Questions from Basic Concepts
The friction force exerted by air on a moving body is called ----
A series of processes to joint various parts to get a complete product is known as _____
The fixing of different parts of a machine properly as per the requirement is called _____.
Arrange the following lamps based on the increasing power rating and energy consumption to provide the same level of Illumination or lighting
A. Incandescent Lamp with efficacy of 10 lumens/watt
B. Compact fluorescent lamp (CFL) with efficacy of 60 lumens/watt
C. Halogen lamp with efficacy of 20 lumens/watt
D. Mercury vapour lamp with efficacy of 40 lumens/watt
E. Light Emitting diode (LED) lamp with efficacy of 80 lumens/watt
Choose the correct answer from the options given below:
- The device in machine which feeds thread in sufficient quantity and tightens loop is :
