An elevator starts on the 10th floor and moves −1, +2, −3, +4, −5, +6 floors. Which floor does it reach?
- 11th Floor
- 12th Floor
- 13th Floor
- None of these
Explanation
Floor changes: 10 → 9 → 11 → 8 → 12 → 7 → 13
Net change = −1 + 2 − 3 + 4 − 5 + 6 = +3
Starting from the 10th floor, the elevator reaches the 13th floor.
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