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RAS question

In a row of 40 students, Ravi is 15th from the left end. What is his position from the right end?

Correct answer: (C) 26th.

In a row of 40 students, Ravi's position from the right end is 26th when he is 15th from the left end.

  1. (A)

    27th

  2. (B)

    25th

  3. (C)

    26th

  4. (D)

    24th

Explanation

For a single row, the two end positions count the same person from opposite directions, so the student's rank is included in both counts. Use the standard relation: position from the right = total students - position from the left + 1. Here, the total number of students is 40 and Ravi is 15th from the left. Substituting the given values gives 40 - 15 + 1 = 26. The added 1 matters because Ravi himself must be counted when switching from the left-end count to the right-end count. The cited calculation source verifies the exact arithmetic expression and returns 26, so Ravi is 26th from the right end.

Why the other options are wrong

  • (A) 27th would overcount by one; applying total - left position + 1 gives 26, not 27.
  • (B) 25th comes from 40 - 15, but that drops the required +1 for counting Ravi himself.
  • (D) 24th undercounts the right-end position; it is neither the direct difference nor the inclusive row-position calculation.

Concept

This tests ranking and ordering in a linear arrangement, especially conversion of a position from one end to the other. RAS reasoning questions often use this idea because it checks careful inclusive counting, not just subtraction.

Source

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