#Arithmetic Progression Problem

12 messages · Page 1 of 1 (latest)

sick oyster
#

1)let Sn be sum of first n terms of ap {An} if S15>0 and S16<0 find maximum ratio S1/A1, S2/A2 ... S15/A15
and
2)Sequence {An} satisfies a1= 0 An+1 = An + 1+ 2 x root(1+An) for n =1,2,.... then A2009 is?

i asked the first sum to sm1 but he said it was incomplete is it incomplete,plz help with these sums

clear fernBOT
#
  1. Wait patiently for a helper to come along.
  2. Once someone helps you, say thank you and close the thread with:
+close
  1. Feel free to nominate the person for helper of the week in #helper-nominations
  2. Do not ping the mods, unless someone is breaking the rules.
  3. If you're happy with the help you got here, and the server overall, you can contribute financially as well:
soft girder
#

wait

#

yeah it seems incomplete, i only got the domain of the first term but we need its exact value in order to find S1/A1.

cerulean kestrel
soft girder
#

i meant the later ones too

#

i only got -7.5d<a<-7d after solving (d>0)

sick oyster
#

okay

#

i have to reconifrm with my teacher if he gave the sums right

soft girder
#

wait

granite patrol
#

It's not incomplete