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Is It Infinitely Increasing? (Posted on 2004-09-30) Difficulty: 3 of 5
How much is 1√(1+ 2√(1+ 3√(1+ 4√(1+ 5√(...)))))? Does it tend to infinity?

Note: the initial 1 is just for completeness!

  Submitted by Old Original Oskar!    
Rating: 3.0000 (8 votes)
Solution: (Hide)
3. This was posed by the indian mathematician Ramanujan. Let's prove, using induction, that m+1= S(m)= 1√(1+m√(1+(m+1)√(1+...))). Obviously, for m=0, S(0)=1. We can write m+1=1√(1+mS(m+1)) and squaring gets m²+2m+1=1+mS(m+1) that agrees with S(m+1)=m+2.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
AnswerK Sengupta2008-03-01 10:45:36
re(2): Solution by GooglingRichard2004-10-13 17:39:07
re: Solution by GooglingDavid Shin2004-10-13 13:07:04
SolutionSolution by GooglingRichard2004-10-13 01:03:52
re(2): interestingBon2004-10-06 03:42:48
re: interestingIra Jewell2004-10-01 17:41:26
re(3): interestingDavid Shin2004-10-01 10:35:34
Solutionre(2): interestinge.g.2004-10-01 08:06:25
Some Thoughtsre: interestinge.g.2004-10-01 07:38:43
Some ThoughtsinterestingLarry2004-10-01 04:06:02
re: hiRandyOrton2004-09-30 15:08:53
Some Thoughtsre: hie.g.2004-09-30 14:55:10
hiayala2004-09-30 14:32:34
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