Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

Find the sum of the series 3 + 9 + 27 + ……+ 6561.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

Here, a = 3, r = 3 and l = 6561

Sum =
Answered by | 04 Jun, 2014, 03:23: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 11-science - Maths
G1, G2, …, Gn are n geometric means between a and b. Find common ratio and (r + 1)th term of this GP (r < n).
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Find three geometric means between the numbers 3 and 48.
Asked by Topperlearning User | 25 Sep, 2017, 03:17: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Find the numbers whose arithmetic mean is 82 and geometric mean is 18.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Find the sum of the series 3 + 9 + 27 + ……+ 6561.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
The A. M. between two positive numbers a and b is twice the G. M. between them. Find the ratio of the numbers.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
If a, b, c, d are in G.P., then prove that  are in G.P.
Asked by Topperlearning User | 25 Sep, 2017, 12:20: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
If the first and the nth term of a G.P. are a and b, respectively, and if P is the product of n terms, prove that .
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Find two positive numbers whose difference is 12 and whose AM exceeds GM by 2.
Asked by Topperlearning User | 25 Sep, 2017, 03:19: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Let ‘a’ be the AM and b & c be two GM’s between two any positive numbers. Then prove that .
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Find n such that  may be the G.M. between positive numbers a and b.
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×