If the sum of n terms of two series of A.P are in the ratio
5n+4:9n+6 .find the ratio of their 13th terms
Answers were Sorted based on User's Feedback
Answer / krishna kumar ranjan
when ever u face this type of qun..
13*2-1=25 and put it in place of n in 5n+4/9n+6
| Is This Answer Correct ? | 61 Yes | 30 No |
Answer / akshay b menon
(5n+4)/(9n+6)=((n/2){2x+(n-1)d})/((n/2){2x'+(n-1)d'})
=(2x+(n-1)d)/(2x'+(n-1)d')
=(x+{(n-1)/2}d)/(x'+{(n-1)/2}d')
implies,
m=(n-1)/2
2m-1=n
since m=13,n=25
substituting value of n in given ratio
(5*25+4)/(9*25+6)=129/231
| Is This Answer Correct ? | 45 Yes | 47 No |
Answer / narayanan
Let the 2 series have the sum S(1,n) and S(2,n).
now, S(1,n):S(2,n) = (5n+4):(9n+6)
= {5(n-1)+5+4}:{9(n-1)+9+6}
= {2*(9/2)+5(n-1)}:{2*(15/2)+9(n-1)}
= [(n/2){2*(9/2)+5(n-1)}]:[(n/2){2*(15/2)+9(n-1)}]
hence nth terms will be in the ratio
T(1,n):T(2,n)= [(9/2)+5(n-1)]:[(15/2)+9(n-1)]
=>T(1,13):T(2,13)=[(9/2)+5(13-1)]:[(15/2)+9(13-1)]
=(129/2):(231/2)
=43/77
| Is This Answer Correct ? | 50 Yes | 67 No |
If ?segment? is coded as rffndou, then ?ritual? is coded as (a) shutbm (b) qjutbk (c) qhutbk (d) qhubtk
What is a homologue?
Which of the following is a recursive set of production (a) S ?> a|A, A ?> S (b) S ?> a|A, A ?> b (c) S ?>aA, A?>S (d) None of these.
If cos2A + cos2B + cos2C = 1 then ABC is which type of triangle?
can u give me an example of a project you were involved with that illustrates your interest and skills in bringing people together?
WHY YOU SELECT BIOINFORMATICS AS YOUR MAJOR FIELD??
Derive e-value ?
How to run DOCK 6 using cygwin?
Why was the PatternHunter software program developed?
What are the bioinformatic tools applied to micromolecular evolution?
The rate of the first order reaction depends on the (a) Concentration of the reactant (b) Concentration of the product (c) Time (d) Temperature.
An electron emits energy (a) Because its in orbit (b) When it jumps from one energy level to another (c) Electrons are attracted towards the nucleus (d) The electrostatic force is insufficient to hold the electrons in orbits.