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Found it on the Webs / Re: Anyone can explain
« on: August 28, 2013, 07:26:56 PM »
Gexxos and Snyler have already got this spot on. But if anyone's still having trouble understanding it..
Let’s say our number is XY. (if you have chosen 92 then X=9 and Y =2).
So the number can be represented as 10X + Y (in our example 10*9 +2 =92)
Now we have to delete both the digits from the original number i.e., 10X +Y – X –Y = 9X.
Now as you can see from above, the final result will be always a multiple of 9. If you have a closer look at the all the numbers that are multiples of 9, you will find the same item tagged to them. That’s a pretty lame trick, I would say.
Let’s say our number is XY. (if you have chosen 92 then X=9 and Y =2).
So the number can be represented as 10X + Y (in our example 10*9 +2 =92)
Now we have to delete both the digits from the original number i.e., 10X +Y – X –Y = 9X.
Now as you can see from above, the final result will be always a multiple of 9. If you have a closer look at the all the numbers that are multiples of 9, you will find the same item tagged to them. That’s a pretty lame trick, I would say.