CrazyEngineers Archive
Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.
@Kaustubh Katdare • 04 Aug, 2008
The series is -


What's the next number in above series?
@bayazidahmed • 07 Aug, 2008 12285

Shall I give the solution or wait for some one else to rattle their brain and figure it out?
@Kaustubh Katdare • 07 Aug, 2008

Shall I give the solution or wait for some one else to rattle their brain and figure it out?
😁 Wait!

If no one replies in next 24 hours, post the explanation!
@bayazidahmed • 09 Aug, 2008 I am too busy to post the explanation now. I'll leave it for another 24 hours.
@mahul • 09 Aug, 2008 Yep, my answer matches with that of bayazidahmed, 12285.

Here's the solution:

Lets name the general term of the sequence T(n)

The sequence (say R(n)) where R(n)=T(n+1)/T(n)
is 1,1.5,2.5,4,6.5...

The sequnece (say S(n)) where S(n)=R(n+1)-R(n)
is 0.5,1,1.5,2.5....

Thus S(n) can be thought of a fibonacci style sequence where S(n)=S(n-1)+S(n-2)
Considering this relation, the next term in S(n) would be 1.5+2.5=4

Considering this, the next trem in R(n) would be 6.5+4=10.5

Thus the next term in T(n)=1170*10.5 = 12285

Related Posts

@Lovesharma · Apr 7, 2012

I've got 10th : 69% and 12th : 60%Btech :1 sem : 65%, 2 sem : 60%, 3 sem : 64%, 4 sem : 69%, 5 sem : 80% (3th...

@vvishwaskumar · Jul 27, 2009

how convergent- divergent nozzle works in relation to pressure/velocity, while steam is passing through it... i m little confuse

@Ankita Katdare · Jan 17, 2014

In the mad frenzy of smartphone launches, Micromax has come up with a new phone in its Canvas series called - Micromax Canvas MAd with a unique feature in India....

@Naman Agarwal · Sep 29, 2012

I am a graduating electrical engineer. and I was asked this question in Viva - What Do you Mean By Earth Potential? I am pretty clueless about it. Please can...

@Ankita Katdare · Jun 19, 2015

A lot of students seem to be complaining that not many core domain companies in mechanical engineering visit for campus placements. I guess they restrict their visits only to top...