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Answer

↓Steps Explained:↓

Calculate the digit sum of 69

Calculate the reduced digit sum of 69

Add up 2 digits of 69:

Digit Sum → 6 + 9 = 15

Since our digit sum > 9:
repeat this process to get the reduced digit sum:
Our new number to evaluate is 15

Add up 2 digits of 15:

Digit Sum → 1 + 5 = 6

Since our digit sum ≤ 9:
we have our reduced digit sum

Final Answer