In a row of 25 students, Sana is 9th from the left. What is her position from the right?
Correct answer: B. 17th
- A. 16th
- B. 17th
- C. 15th
- D. 18th
Explanation
The position from the right is the total minus the position from the left plus one, so 25 minus 9 plus 1 gives 17. Omitting the plus one yields 16, which is the trap in the first option. The formula follows from the same double counting logic as the earlier queue question.
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About Logical Deductions
Logical deductions require conclusions to be drawn from stated facts, conditions and relationships without adding outside information. The work includes handling all, some and none statements, necessary and sufficient conditions, ordering restrictions, true or false conclusions, and the difference between what must be true and what could be true.
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