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3 years ago

Plsssss helppp sooonnnn

Mathematics

1 answer:

Oxana [17]3 years ago

5 0

Answer:

4 and -6≤x<0

Step-by-step explanation:

6. 4

7. -6≤x<0

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In a small chess tournament, 20 matches were played. Find out how many people were involved if it is known that each participant

Nina [5.8K]

Answer:

5 players participated in the tournament.

Step-by-step explanation:

In a small chess tournament, 20 matches were played.

Let us assume that n number of players participated in the tournament

As in each game 2 players play, so the number of ways they can play is,

$=\ ^nC_2$

As they played 2 games with every other participant in the tournament.

So the total number of games is,

$=\ 2\times ^nC_2$

But it is given to be 20, so

$\Rightarrow \ 2\times ^nC_2=20$

$\Rightarrow \ ^nC_2=10$

$\Rightarrow \dfrac{n!}{2!(n-2)!}=10$

$\Rightarrow \dfrac{n(n-1)}{2}=10$

$\Rightarrow {n(n-1)=20$

As $5\times 4=20$ , so we get n=5.

Therefore, 5 players participated in the tournament.

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3 years ago

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3 years ago

What did I do wrong and what is the right answer

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3 years ago

What is -1/6 multiplied by 6

Tems11 [23]

Answer:

$-1$

Step-by-step explanation:

Step 1: Multiply

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$-\frac{6}{6}$

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Step-by-step explanation:

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