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1. |
A is 7th from the left and B is 9th from the right in the bus stop queue. These two interchange their positions with each other. Now A's position becomes 11th from the left. What is the number of persons in the queue? |
A. | 18 |
B. | 19 |
C. | 20 |
D. | 21 |
Answer» C. 20 | |