#3
All multiples of 9 on the board that are possible have the same symbol. It is a mathematical impossibility that if you follow the instructions, it will be wrong.

Edit: ^^ Also that.
#9
whatever number you think of will always be in the nine times table, and look at the symbols for all the numbers in the nine times table. theyre all identical. It is a very clever yet simple trick.
X


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I guess that's what they all say
Just before they fall apart"
#10
Whatever two-digit number "ab" you choose, it can be written a*10^1 + b*10^0.
When you follow the advise, you are doing this:

(10*a + b) - (a + b) = 9*a.

So, it doesn't matter what number you choose. The answer will always be multiple of 9. And all the symbols of multiples of 9 are identical, so...
#11
Quote by laodikea
Whatever two-digit number "ab" you choose, it can be written a*10^1 + b*10^0.
When you follow the advise, you are doing this:

(10*a + b) - (a + b) = 9*a.

So, it doesn't matter what number you choose. The answer will always be multiple of 9. And all the symbols of multiples of 9 are identical, so...


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+1