Question

The sums of n terms of two AP's are in the ratio 5n+4:9n+6..Find ratio of 18th terms

Answer 1

\[\LARGE \frac{a+(n-1)d}{a'+(n-1)d'}=\frac{5n+4}{9n+6}\]

Answer 2

I heard we do some hit n trial here,idk that

Answer 3

not hit and trial, we just HIT!

Answer 4

:|

Answer 5

sum of n terms = S_n ,(say)

nth term = a_n, (say)

Can you say that S_1 = a_1 ?

Answer 6

yes

Answer 7

So you can find the ratio of 1st terms of both the APs now ?

Answer 8

no:P

Answer 9

just substitute n=1

Answer 10

:O

Answer 11

Can you substitute n=18 ?

Answer 12

better substitute n=35!
:P