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99 for odd powers (Posted on 2012-07-14) Difficulty: 2 of 5
Consider the following results:
99^1 = 99
99^2 = 9801
99^3 = 970299
99^4 = 96059601
99^5 = 9509900499

Prove that 99^n ends in 99 for all odd n.

Source: mathschallenges 2003

No Solution Yet Submitted by Ady TZIDON    
Rating: 3.6667 (3 votes)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionAnother wayHarry2012-07-15 11:04:03
SolutionPrimary-school proof.broll2012-07-15 01:12:05
SolutionProofMath Man2012-07-14 20:50:13
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