In a row of students, Ravi is 3th from the left and 7th from the right. How many students are in the row?
Answer and explanation
Correct answer: D. 9
- Step 1: State the linear ranking formula for a person counted from both ends of a line: .
- Step 2: Substitute Ravi's positions from each side: .
- Step 3: Subtract to correct for double-counting Ravi: .
Answer
9.
Why not the others: The remaining options (21, 10, 11) violate logical deduction rules, confuse necessary and sufficient conditions, or stem from calculation slips.
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