The repeated digital sum, or digital root of 6788 is 2.

6+7+8+8 = 29

2+9 = 11

1+1 = 2.

What is the Digital root of the 180 digit number 1011121314.... ....96979899 made from the numbers 10 to 99 ?

• Sum of 1011121314...99 is 4806. Again adding we get 18, which again sums up to 9. so ans is 9.
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