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scZoUnD [109]
3 years ago
7

There are 25 towns in a certain country, and every pair of them is connected by a train route. How many train routes are there?

Mathematics
1 answer:
7nadin3 [17]3 years ago
5 0

Answer:

13

Step-by-step explanation:

a pair=2

so 25/each pair of towns

25/2=12+1=13

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If he answered 3 questions correctly, then the number of questions is got wrong is 7 and the number of questions that he did not attempt is 5.

<h3>What is the linear system?</h3>

A linear system is one in which the parameter in the equation has a degree of one. It might have one, two, or even more variables.

In a class test of 15 questions, (+4) marks are given for every correct answer, (– 2) marks are given for every incorrect answer, and 0 marks are given for questions that are not attempted. Punit scored (– 2) marks.

If he answered 3 questions correctly, then the number of the question are got wrong and the number of the question that he did not attempt.

Let x be the correct question and y be the incorrect question, z be the number of questions that he did not attempt, and A be the number of the total score. Then we have

4x – 2z = A

x + y + z = 15

If A = -2 and x = 3, then we have

4 × 3 – 2z = -2

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              z = 7

Then the value of y will be

3 + y + 7 = 15

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More about the linear system link is given below.

brainly.com/question/20379472

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Your answer would be C
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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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