Search found 2 matches

by MathWasheefSci
Sat Dec 17, 2011 7:04 am
Forum: Higher Secondary Level
Topic: Prove me wrong
Replies: 95
Views: 29831

Re: Prove me wrong

Well done! Pritom! :D
by MathWasheefSci
Sun Jan 09, 2011 9:34 am
Forum: Higher Secondary Level
Topic: Find the Sum of a Sequence
Replies: 3
Views: 1865

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...