there is no magic in this. its simple maths. see below.... 10X+Y= any 2 digit number you think in mind where X and Y are any nos from 1 - 9 Now (10X + Y) - (X+Y) = 10X+Y-X-Y =9X All results are in multiple of 9 and picture he shows you in front of nos 9, 18, 27, 36, 45, 54, 63, 72
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