A total of 38 people are standing in a row facing north. Dilip is 16th from…
2026
A total of 38 people are standing in a row facing north. Dilip is 16th from the left end, while Waseem is 9th from the right end. How many people are there between Dilip and Waseem?
Answer: C. 13 — CONCEPTWhen two ranks are measured from opposite ends of a row, first convert both ranks to positions from the same end. For a row of N people, a person who…
- A.
12
- B.
10
- C.
13
- D.
11
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Show answer & explanation
Correct answer: C
CONCEPT
When two ranks are measured from opposite ends of a row, first convert both ranks to positions from the same end. For a row of N people, a person who is r-th from the right is (N - r + 1)-th from the left. The number strictly between positions p and q is |p - q| - 1.
APPLICATION
Let the total number of people be N = 38. Dilip is at position 16 from the left.
Waseem’s position from the left is 38 - 9 + 1 = 30.
Therefore, the number of people between them is |30 - 16| - 1 = 14 - 1 = 13.
CROSS-CHECK
The positions strictly after Dilip and before Waseem are 17 through 29. Their inclusive count is 29 - 17 + 1 = 13, which agrees with the rank formula.
RESULT
There are 13 people between Dilip and Waseem.