CBSE Class 10 Answered
About an A.P sum.............
Asked by | 25 Feb, 2008, 03:09: PM
Expert Answer
Your question was
The ratio of the sum of n terms of two AP is (4n+2): (3n+47).find the ratio of the 9th term.
Let the I term and common difference of the AP be a and d and for the II AP it will be
a' and d' respectively
According to the given Condition
n/2(2a+(n-1)d): n/2(2a'+(n-1)d') = (4n+2): (3n+47)
i.e (2a+(n-1)d): (2a'+(n-1)d') =(4n+2): (3n+47)
i.e (a+(n-1)d/2):(a'+(n-1)d/2)=(4n+2): (3n+47)
substituting n=17 in both sides we get
(a+8d):(a'+8d') = 70:98
(a+8d):(a'+8d') = 5:7
Answered by | 05 Dec, 2017, 05:43: PM
Application Videos
-
Arithmetic Progression - Common Difference
The video explains an example based on the concept of common difference ...
-
Common Difference of an Arithmetic Progression
The video explains a question based on finding the common difference whe...
Concept Videos
-
Introduction to Arithmetic Progression
This video explains the identification of series which is mathematically kn... -
Introduction to Arithmetic Progression
This video explains the identification of series, mathematically known as A... -
Introduction to AP and related concepts
Identification of series, mathematically known as Arithmetic Progression an...
CBSE 10 - Maths
Asked by shaikhyakub9946 | 30 Nov, 2023, 11:50: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by samiranroychowdhury942 | 19 Jul, 2022, 08:37: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by madhushreemahesh1986 | 10 Feb, 2022, 05:19: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by mohammeduzaib786 | 27 May, 2021, 04:00: PM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by poojakanchan | 10 Mar, 2021, 11:38: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by chshandi2005 | 21 Dec, 2020, 11:31: AM
ANSWERED BY EXPERTCBSE 10 - Maths
Asked by ruparupasri77 | 22 Sep, 2020, 12:44: PM
ANSWERED BY EXPERT
