Q. If 19 $ 7 = 312 and 23 $ 9 = 448, then 31 $ 11 = ?
A) 441
B) 231
C) 840
D) 641
✔ Correct Answer: 840
Exam Insight
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A) 441
B) 231
C) 840
D) 641
✔ Correct Answer: 840
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