- A10
- B9
- C18
- D8
Step-by-Step Solution
Any multiple of 9 has a digit sum that reduces to 9. , and 4+2+3 = 9.
Answer: B) 9
Look at the pattern: .
The digit sum of each product is always 9 (1+8 = 9, 2+7 = 9).
What is the digit sum of ?
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