Which roll number has a digital root equal to 9? Digital root = sum of digits until one digit remains.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 999999.
To find which roll number has a digital root = 9 (sum digits repeatedly until one digit remains).
Check digit sums:
987654 → 39 → 12 → 3
888888 → 48 → 12 → 3
765431 → 26 → 8
999999 → 54 → 9