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 Another Math Mind-bender
 Redngold From United States of America, joined Mar 2000, 6907 posts, RR: 43Posted Fri Sep 29 2000 01:01:11 UTC (14 years 6 months 3 days 21 hours ago) and read 969 times:

 0.99999... = 1 Let x = 0.99999... Therefore, 10x = 9.99999.... 10x - x = 9x Therefore, 9.99999... - 0.99999.... = 9 9x = 9 Therefore, x = 1 That's the Algebraic conundrum. If you want to know how to solve this seeming paradox, take Calculus! redngold
 Up, up and away!
 Pacific From Hong Kong, joined Mar 2000, 1101 posts, RR: 0 Reply 1, posted Fri Sep 29 2000 02:23:48 UTC (14 years 6 months 3 days 19 hours ago) and read 793 times:

 This is in the British curricilum for secondary 5 or 6. People taking GCSE maths have to learn it so I know how to do it!
 Redngold From United States of America, joined Mar 2000, 6907 posts, RR: 43 Reply 2, posted Fri Sep 29 2000 04:22:56 UTC (14 years 6 months 3 days 17 hours ago) and read 789 times:

 That's cool. But can you prove it correct or incorrect? We can see easily that algebra proves a seeming paradox. What does calculus have to say about this? One word: LIMITS! redngold
 Up, up and away!
 Pacific From Hong Kong, joined Mar 2000, 1101 posts, RR: 0 Reply 3, posted Fri Sep 29 2000 04:38:22 UTC (14 years 6 months 3 days 17 hours ago) and read 787 times:

 I've just started my British A-Level maths course in September so I've not learnt calculus yet! We don't do calculus in GCSE!
 Oxygen From Hong Kong, joined Sep 1999, 675 posts, RR: 1 Reply 4, posted Sat Sep 30 2000 17:24:41 UTC (14 years 6 months 2 days 4 hours ago) and read 774 times:

 x=0.999999999999999........= lim[x>1] x 10x-x = 10 lim[x>1] x - lim[x>1] = 9 lim[x>1] = 9 (1) = 9 So 9x Tends to 9.
 Flyf15 From , joined Dec 1969, posts, RR: Reply 5, posted Sat Sep 30 2000 18:40:18 UTC (14 years 6 months 2 days 3 hours ago) and read 770 times:

 I loved learning that back in Calc 1. Aren't limits fun?
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