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Answer
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Digit Sum = 6
Reduced Digit Sum = 6

↓Steps Explained:↓

Calculate the digit sum of 51

Calculate the reduced digit sum of 51

Digit Sum

Add up 2 digits of 51:

Digit Sum → 5 + 1 = 6

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

Final Answer

Digit Sum = 6
Reduced Digit Sum = 6
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