Question
Quantitative Ability and Data Interpretation Question on permutations and combinations
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. A becomes 11th from the left. How many people are there in the row?
A
18
B
19
C
20
D
21
Answer
19
Explanation
Solution
The correct option is (B) :19.