perplexus.info :: Just Math : Proof

Proof (Posted on 2002-05-29)

Prove that 3.999... = 4

See The Solution Submitted by Half-Mad

Rating: 3.6667 (9 votes)

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doin my part to balance the playing field

| Comment 36 of 45 |

let x = 0.999...

=> 10x = 9.999...

=> 10x - x = 9x = 9

=> x = 1

therefore 3.999... = 3 + x = 3 + 1 = 4 QED

Posted by Josh70679 on 2005-10-20 17:23:01

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