Question

In a Geometric progression :
a5 is 24 more than a3.
if terms are Integer and +. a3+a5=?

Answer 1

hi :)
can you please post the exact question?
" & +. a3+a5=?" is not making much sense...

Answer 2

i mean if terms are integer and positive.a3+a5=????!

Answer 3

so we have a5-a3 = 24
and we need a5+a3
right ?
you know the formula for n'th term of arithmetic series ??

Answer 4

right. this is a Geometric progression not arithmetic progression!

Answer 5

Hi, I got it.

Answer 6

Hartnn, continue. I'd type it later.

Answer 7

Sorry lol. Wrong one.

Answer 8

sorry i got disconnected.
yeah, i mistyped it as arithmetic.
we have ar^4-ar^2=24
and we need ar^4+ar^2 , hmmm...
any more info given ??

Answer 9

no :((

Answer 10

i hope 1st or 2nd term was given, but let me try

ar^2(r^2-1) = 24
since all terms are integer, r cannot be very large,
trying r=2 ,
a *4 (3) = 24
a= 2

so, terms = 2,4,8,16,32,...
a3 = 8,
a5=32
difference = 32-8 = 24 as we needed!

Answer 11

but this was guess and check method ...

Answer 12

got what i did ?

Answer 13

also r can't be 1, then, a= 0
r can't be 3, then a= fraction, not integer

Answer 14

I had the same work :P

Answer 15

i believe you parth :)

Answer 16

Sarcasm...

But something that was different is I had ar^2(r+1)(r-1) = 24 and I considered factors of 24 that were in the form r + 1 and r - 1 and then I eliminated 3,5 andc7 like you did

Answer 17

Believe me now? :p

Answer 18

yup, still do.