Thursday, July 23, 2009

Interesting puzzle

Try it.
Can you guess the trick?
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3 comments:

Student said...

Very interesting! All possible solutions 0, 6, 18, ..., 81 have the same symbols. It's just that the symbols keep changing on the table. :)

July 23, 2009 7:47 AM
Anonymous said...

Whichever two digits that you choose, after substracting the "new number" will end up being a number which is a multiple of 9.

With that, only one symbol will match .

Tommy

July 23, 2009 12:25 PM
Anonymous said...

Let the no. chosen be 10*X + Y.
Following the operation request would lead to
10*X + Y - (X + Y)= 9*X
which is a multiple of 9.
All "multiple of 9" symbols are the same. Hence there is only one answer.

July 23, 2009 8:37 PM

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