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In a row at a bus stop, A is 7th from the left and B is 9th from the right. Both of them interchange their positions and thus A becomes 11th from the left. How many people are there in that row?
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- 18
- 19
- 20
- 21
- None of these
Correct Option: B
After interchanging their positions, position of A from left = 11
Then positions of A from right = 9.
∴The total no. of people in the row
= (9 + 11) – 1 = 19.
