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Amhuxt.391 net.math utcsrgv!utzoo!decvax!ucbvax!ihnss!eagle!mhuxt!rwhaas Wed Mar 17 11:34:57 1982 Re: You Too Can Be A Math Genius Of course there is nothing wrong with the proof that .999... is equal to 1. In general, x = a + ar + ar^2 + ...

r*x = ar + ar^2 + ...

and on subtraction,

x(1-r) = a or x = a/(1-r)

the usual sum of a geometric series. In the example given, take a=.9 and r=.01.

Roy Haas (Bell Labs, Indian Hill)

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