how many terms of the series …
CBSE, JEE, NEET, CUET
Question Bank, Mock Tests, Exam Papers
NCERT Solutions, Sample Papers, Notes, Videos
Posted by Kartik Sharma 4 years, 5 months ago
- 1 answers
Related Questions
Posted by Sethpoulou Apoulou 8 months ago
- 0 answers
Posted by Ashish Chaudhary 7 months, 2 weeks ago
- 1 answers
Posted by Sana Dharwad 7 months, 2 weeks ago
- 0 answers
Posted by Sabin Sultana 7 months, 2 weeks ago
- 0 answers
Posted by Manoj Thakur 7 months, 3 weeks ago
- 0 answers
Posted by Gurleen Kaur 7 months, 3 weeks ago
- 0 answers
Posted by Ananya Sv 7 months, 3 weeks ago
- 1 answers
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Gaurav Seth 4 years, 5 months ago
A/C to question,
d%5D%5C%5C%5C%5Cwhere%2C%20d%5C%3Ais%5C%3A%20common%20%5C%3A%20difference%5C%3Aa%5C%3Ais%5C%3A1st%5C%3Aterm)
3%5D%5C%5C%5C%5C306%5Ctimes2%3Dn%5B18%2B3n-3%5D%5C%5C%5C%5C612%3D15n%2B3n%5E2%5C%5C%5C%5Cn%5E2%2B5n-204%3D0%5C%5C%5C%5Cn%3D%5Cfrac%7B-5%5Cpm%5Csqrt%7B25%2B816%7D%7D%7B2%7D%5C%5C%5C%5Cn%3D12%2C-17%5C%5C%5C%5Chence%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20%5C%3A%20n%3D12)
9 + 12 + 15 + ....... n terms = 306
you can see that ,
common difference of the series is always equal to 3 . e.g (12 - 9) = (15 - 12) = 3
so, this series is in AP .
now,
Let total number of terms = n in such a way that sum of n terms = 306.
we know,
here, a = 9 , d = 3 and Sn = 306
now,
2Thank You