Another nice inequality...

Another nice inequality...

Posers and Puzzles

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D

Joined
25 Aug 06
Moves
0
25 Oct 07

n is an integer >1. Prove:

sqrt(1+sqrt(n+sqrt((n^2)+sqrt((n^3)+...+sqrt(n^n)))...) < n

Example: if n=3 we get

sqrt(1+sqrt(3+sqrt(9+sqrt(27)))) < 3

D

Joined
01 May 07
Moves
27311
30 Oct 07

Originally posted by David113
sqrt(1+sqrt(3+sqrt(9+sqrt(27)))) < 3
Could it be written this way?

[(1+(3+(9+(27^1/2)^1/2)^1/2)^1/2)]^1/2 < 3

D

Joined
25 Aug 06
Moves
0
30 Oct 07

Originally posted by Drew L
Could it be written this way?

[(1+(3+(9+(27^1/2)^1/2)^1/2)^1/2)]^1/2 < 3
Yes