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MATH 115A  Additional Example of the Principle of
Mathematical Induction
Paul Skoufranis
September 28, 2011
In this document we will present an additional example to demonstrate the Principle of Mathematical
Induction.
Example)
You are given three pegs. On one of the pegs is a tower made up of
n
rings placed on top
of one another so that, as you move down the tower, each successive ring has a larger diameter than the
previous ring. The object of the puzzle is to reconstruct the tower on one of the other pegs by mov
ing one ring at a time from one peg to another in such a manner that you never have a larger ring above
any smaller ring on any of the 3 pegs. Prove that, for any
n
∈
N
, the puzzle can be completed in 2
n

1 move.
Proof
: We will apply the Principle of Mathematical Induction to the statements
P
n
where
P
n
is statement
that the puzzle with
n
rings can be solved in 2
n

1 steps.
Base Case:
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This note was uploaded on 04/09/2012 for the course MATH 172a taught by Professor Kong,l during the Fall '08 term at UCLA.
 Fall '08
 Kong,L
 Math, Addition, Mathematical Induction

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