In a row at a bus stop, ‘A’ is 7th from the left and

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In a row at a bus stop, ‘A’ is 7th from the left and ‘B’ is 9th from the right. They both interchange their positions. Now A becomes 11th from the left. How many people are there in the row?

1. 10
2. 20
3. 19
4. 18

Correct Option: C

According to question ,
A is 7th from the left and B is 9th from the right.
After interchanging their positions ,
Now A becomes 11th from the left.
∴ Total number of people in the row = A's position + B's position - 1
Total number of people in the row = 11 + 9 – 1 = 19