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The Magic Cafe Forum Index » » Puzzle me this... » » Sum problem (0 Likes) Printer Friendly Version

Stephen Buxton
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Using all the digits from one to nine only once, make up three numbers of three digits each. Add these three numbers together to give you an answer.

There are a lot of possible answers you can get - how many of these are prime?
If you put an infinite number of apes in front of an infinite number of computers, you get a pretty good idea of what internet chat rooms can be like
Sapient
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None are prime. This can be demonstrated with a simple mental exercise that will amaze us all.

At least that is what I am guessing. Smile
TomasB
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If a digital root of a number is 9, it is dividable by 9, so no matter how you arrange and sum up the digits from 1 to 9 (1+2+...+9 has a digital root of 9) you always get a number dividable by 9.

Sapient got it. Smile

/Tomas
Stephen Buxton
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Indeed he did! Well done, all
If you put an infinite number of apes in front of an infinite number of computers, you get a pretty good idea of what internet chat rooms can be like
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