I haven’t solved it mathematically i.e. rigorously; I have used trial and error. Solving mathematically would take way too much time from an exam point of view – in that situation I would use the answer choices (I have covered a couple of similar questions in the paperless series of posts…)
CAT-holics 
If the 2nd level becomes a GP ?
say, a sequence -1, 5, 13, 25, 45….
so the 1st level becomes -6-8-12-20-
and the 2nd is -2-4-8-
Also, what pattern can be formed for this sequence ?
Thanks 🙂
Harsh, I suspect it will turn out to be a sequence of the form 2^n + an + b or similar….here a little trial and error is giving me 2^n + 4n – 7
regards
J
What have you taken the 2 in (2^n) as, the first term of the GP or the common ratio ?
Can we generalise for a GP ?
Thanks
I haven’t solved it mathematically i.e. rigorously; I have used trial and error. Solving mathematically would take way too much time from an exam point of view – in that situation I would use the answer choices (I have covered a couple of similar questions in the paperless series of posts…)
regards
J