If '?' represents addition, '?' represents subtraction, '?' represents multiplication, and '?' represents division, which of the following equations is correct? 4 ? 3 ? 2 ? 2 ? 1 = ?
Answer: B. 10
Following BODMAS: 4 ? 3 = 7, then 7 ? 2 = 14, 14 ? 2 = 7, and finally 7 ? 1 = 6.