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You're right. I looked at it for three minutes the first time. With
the change each time and the subset of viable numbers available (any time you add the numbers of a two-digit number and then subtract that sum from the original number, there are only 9 possible answers) after "subtracting," you give the 9 possible answers the same symbol. It will work every time. Frank Reid |
#2
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Still seems pretty spooky though.
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#3
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![]() "Frank Reid" wrote in message ups.com... You're right. I looked at it for three minutes the first time. With the change each time and the subset of viable numbers available (any time you add the numbers of a two-digit number and then subtract that sum from the original number, there are only 9 possible answers) after "subtracting," you give the 9 possible answers the same symbol. It will work every time. Frank Reid In math circles, its called "Casting out Nines". You get the same effect on this site: http://digicc.com/fido/ --riverman |
#4
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![]() riverman wrote: "Frank Reid" wrote in message ups.com... You're right. I looked at it for three minutes the first time. With the change each time and the subset of viable numbers available (any time you add the numbers of a two-digit number and then subtract that sum from the original number, there are only 9 possible answers) after "subtracting," you give the 9 possible answers the same symbol. It will work every time. Frank Reid In math circles, its called "Casting out Nines". You get the same effect on this site: http://digicc.com/fido/ --riverman Something for a math class sometime. http://adrian.ziemkowski.com/livejou...ic_numbers.php |
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