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Preeti is 13th from the left end and Geet is 16th from the right end. They interchange their positions, and Rahul who sits 20th from the left end sits at the 4th place to the left of Preeti's new position. How many persons were there in the row if all are facing north?a.42b.39c.None of thesed.40Clear my choice

Question

Preeti is 13th from the left end and Geet is 16th from the right end. They interchange their positions, and Rahul who sits 20th from the left end sits at the 4th place to the left of Preeti's new position. How many persons were there in the row if all are facing north?a.42b.39c.None of thesed.40Clear my choice

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Solution

The problem can be solved in the following steps:

  1. Preeti is 13th from the left end and Geet is 16th from the right end. When they interchange their positions, Preeti will be 16th from the right end and Geet will be 13th from the left end.

  2. Rahul is 20th from the left end and sits at the 4th place to the left of Preeti's new position. This means Rahul is sitting at the 20th - 4 = 16th position from the left end.

  3. Since Preeti and Rahul are at the same position from the left end after the interchange, it means that Preeti's new position (16th from the right end) is also the 16th position from the left end.

  4. Therefore, the total number of persons in the row is 16 (from the left end) + 16 (from the right end) - 1 (since we are counting the same person twice) = 31.

So, the answer is not in the options given. The correct answer is 31.

This problem has been solved

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