Which seat number-student combination is impossible?
Options:
A .  
3rd seat-23
B .  
7th seat-29
C .  
2nd seat-31
D .  
3rd seat-29
Answer: Option D : D Bench 251234245276783193210 Case 2: 24 on 6th Bench and 27 on 5th Bench 251312342752467893210 Now going from the answer options all the combinations is possible.
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