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Harlamova29_29 [7]
3 years ago
14

in a round robin tennis tournament involving 7 players, each player will play every other player twice. How many total matches w

ill be played in the tournament?
Mathematics
1 answer:
baherus [9]3 years ago
8 0
Total number of ways to make a pair:

The first player can be any one of 7 .  For each of those . . .
The opponent can be any one of the remaining 6 .

Total ways to make a pair  =  7 x 6 = 42 ways .

BUT ... every pair can be made in two ways ...  A vs B  or  B vs A .
So 42 'ways' make only (42/2) = 21 different pairs.

If every pair plays 2 matches, then  (21 x 2) = <em><u>42 total matches</u></em> will be played.


Now, is that an elegant solution or what !
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The ratio of ages of kissi and esinam is 3:5 and esinam is 3:5 The sum of ages of all 3 is 147 years.whats the age difference be
Sergio039 [100]

Answer:

48 years.

Step-by-step explanation:

Consider the complete question is "The ratio of ages of kissi and esinam is 3:5 and that of esinam and lariba is 3:5. The sum of ages of all 3 is 147 years. whats the age difference between oldest and youngest ?"

It is given that

Kissi : Esinam = 3:5 = 9:15

Esinam : Lariba = 3:5 = 15:25

So, the combined ratio is Kissi : Esinam : Lariba = 9:15:25

Let ages of Kissi, Esinam, Lariba are 9x, 15x and 25x.

Sum of ages of all 3 is 147 years.

9x+15x+25x=147

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x=3

The value of x is 3. So, the age of all three are

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Esinam=15x=15(3)=45

Lariba=25x=25(3)=75

Since Lariba is oldest and Kissi is youngest, therefore, the difference between their ages is

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Hence, difference between oldest and youngest is 48 years.

8 0
2 years ago
21. The​ solution(s) is/are b =<br><br>Please help me solve this
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Answer:

<u>b = -4, 0</u>

Step-by-step explanation:

<u>Given</u> :

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<u>The correct answer is </u><u>all of the above.</u>

Why is the range the most convenient measure of variability?

  • Your data's spread from the lowest to the greatest value in the distribution is indicated by the range.
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How do you find the range?

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