No products in the cart.

how many terms of the series …

CBSE, JEE, NEET, CUET

CBSE, JEE, NEET, CUET

Question Bank, Mock Tests, Exam Papers

NCERT Solutions, Sample Papers, Notes, Videos

how many terms of the series 9+12+15....should be added to get the sum as 306
  • 1 answers

Gaurav Seth 4 years, 5 months ago

A/C to question,
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,

http://mycbseguide.com/examin8/

Related Questions

Square of 169
  • 1 answers
2nC2:nC3=33:10
  • 0 answers
Express the complex number i-39
  • 0 answers
Ch 1 ke questions
  • 1 answers
Find the product. (4x²) (–5³)
  • 0 answers
(3+i)x + (1-2i) y +7i =0
  • 1 answers

myCBSEguide App

myCBSEguide

Trusted by 1 Crore+ Students

Test Generator

Test Generator

Create papers online. It's FREE.

CUET Mock Tests

CUET Mock Tests

75,000+ questions to practice only on myCBSEguide app

Download myCBSEguide App