C9c9 rule of calculation.
123456789. Add up. Ans will be zero if u add according to school basics. But consider zero when u see nine or the addition of two or more numbers come to nine. Like 9=0, 1+8=9=0, 7+2=9=0, 6+3=9=0, 4+5=9=0. So the total of 123456789 will be zero
how this work ?
Can you give an example .
Cancel 9. When you get the total as 9, consider it as 0(ze ro)