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24 students are sitting in a row. F is 17th from the right end and R is 19th from the left end. How many students are between F and R?
Question

24 students are sitting in a row. F is 17th from the right end and R is 19th from the left end. How many students are between F and R?

A.

10

B.

9

C.

11

D.

3

Correct option is A

Given: 
24 students are sitting in a row.
F is 17th from the right end
R is 19th from the left end.
From the given information linear image will be: 
Formula: Number of persons between two different persons = [(Position of person from left + Position of person from right) - Total number of person] - 2
= 17 + 19 - 24 - 2 
= 36 - 26 
= 10 
Only 10 students are between F and R.
Thus, the correct option is (a) 10.

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