Search found 2 matches
- Sat Dec 17, 2011 7:04 am
- Forum: Higher Secondary Level
- Topic: Prove me wrong
- Replies: 95
- Views: 54730
Re: Prove me wrong
Well done! Pritom!
- Sun Jan 09, 2011 9:34 am
- Forum: Higher Secondary Level
- Topic: Find the Sum of a Sequence
- Replies: 3
- Views: 3055
Re: Find the Sum of a Sequence
I have another technique. Given that \[a_{1}+a_{2}+a_{3}+.......+a_{98}=137 \] \[\Leftrightarrow S+a_{1}+a_{3}+a_{5}+.......+a_{97}=137\; ;[let\, \; a_{2}+a_{4}+.....+a_{98}=S] \]\[\Leftrightarrow S+a_{1}+(a_{2}+1)+(a_{4}+1)+.......+(a_{96}+1)=137\; \: ;[\because a_{n+1}=a_{n}+1] \]\[\Leftrightarrow...