Time to revise table of 9
A 153788 digit number is multiplied with nine and the digits of the number obtained after multiplication are written on a black board, after that the numbers on black board are added and the digits of the obtained number (after addition) are again written on black board and all previously written numbers are erased this process is continued untill we left with a number lying between 0 and 10 find out that last number left on the black board
The answer is 9.
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