Discussion
Which of the following cannot be a possible sitting order from front to back ?
Answer: C
The order that cannot occur is AFEB.
Taking one student from each bench, from front to back, the possible students are: bench 1, A or B or H; bench 2, D or C or E; bench 3, F or C or E; bench 4, G or B or H.
In AFEB, F is the student from bench 2, but F always sits on bench 3, so this order is impossible.
The others fit: ADFG takes A, D, F and G from benches 1 to 4; ADFB has B on bench 4; HCEG has H on bench 1, C on bench 2 and E on bench 3, which keeps C and E apart as required.
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