In a row of students, Sohan is 9th from either end of the row. Find the number of students in a row.
A
10
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B
18
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C
17
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D
19
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E
None of these
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Solution
The correct option is C 17 Clearly, the number of students in a row are N = Top rank + Bottom rank -1 = Tr + Br- 1 = 9 + 9-1 =17 So the answer is (c) Remember (i) N = Tr + Br - 1 (ii) Tr = (N + 1) - Br (iii) Br = (N + 1) - Tr.