If Roll no 31 sits immediately before Roll no 23, then who sits immediately after 24? Options: A . &nbsp 27 B . &nbsp 26 C . &nbsp 29 D . &nbsp Cannot be determined

If Roll no 31 sits immediately before Roll no 23, then who sits immediately af

Question

If Roll no 31 sits immediately before Roll no 23, then who sits immediately after 24?

Options:

A . 27

B . 26

C . 29

D . Cannot be determined

Answer: Option D
:
D
31 is sitting immediately before 23
1: 24 on

5^{t h}

Bench and 27 on

6^{t h}

Bench

\frac{31}{1} \frac{23}{2} \frac{}{3} \frac{}{4} \frac{24}{5} \frac{27}{6} \frac{}{7} \frac{}{8} \frac{}{9} \frac{}{10}

This case is not the best case because we have to seat 25 and 32 as far as possible is at extreme ends.
Case 2: 24 on

6^{t h}

Bench and 27 on

5^{t h}

Bench

\frac{25}{1} \frac{31}{2} \frac{23}{3} \frac{30}{4} \frac{27}{5} \frac{}{7} \frac{}{8} \frac{}{9} \frac{32}{10}

26 and 28 sit on consecutive seats is either on

7^{t h}

and

8^{t h}

Bench or on

8^{t h}

and

9^{t h}

Bench and 29 can sit on

7^{t h}, 8^{t h} o r 9^{t h}

Bench
Therefore 30 sits on

4^{t h}

Bench

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