1
22
12. The sum of the first n terms of series is 3n+ n. Find the nth term of the series and...
![subject](/tpl/images/cats/mat.png)
Mathematics, 19.03.2021 14:00 saidee1143
1
22
12. The sum of the first n terms of series is 3n+ n. Find the nth term of the series and show
that the series is an arithmetic progression. State the value of the first term and the common
difference.
13. In a geometrical progression, the sum of the first two terms is 3, and the sum of the second
and third terms is -6. Find the first term and the common ratio.
14. How many terms of the series 2 - 6 + 18 – 54 + ... are needed to make a total of 1 (1-38)?
![ansver](/tpl/images/cats/User.png)
Answers: 2
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Other questions on the subject: Mathematics
![image](/tpl/images/cats/mat.png)
![image](/tpl/images/cats/mat.png)
Mathematics, 21.06.2019 13:30, chriscendypierre56
At dinner, 2/5 of the people had fish and 1/3 had chicken. if everyone else had lamb, what fraction of the people had lamb? and if 40 people had lamb , calculate the total number of people at the dinner.
Answers: 1
![image](/tpl/images/cats/mat.png)
You know the right answer?
Questions in other subjects:
![Konu](/tpl/images/cats/mir.png)
![Konu](/tpl/images/cats/mat.png)
![Konu](/tpl/images/cats/mat.png)
Mathematics, 27.11.2020 15:10
![Konu](/tpl/images/cats/mat.png)
Mathematics, 27.11.2020 15:10
![Konu](/tpl/images/cats/ekonomika.png)
Business, 27.11.2020 15:10
![Konu](/tpl/images/cats/en.png)
English, 27.11.2020 15:10
![Konu](/tpl/images/cats/fizika.png)
Physics, 27.11.2020 15:10
![Konu](/tpl/images/cats/himiya.png)
Chemistry, 27.11.2020 15:10
![Konu](/tpl/images/cats/health.png)
Health, 27.11.2020 15:10
![Konu](/tpl/images/cats/mat.png)
Mathematics, 27.11.2020 15:10