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Five workers are seated in a row. The constraints: A is not adjacent to B; C is between A and D; E is at one end. If the row starts with E at the left, which valid order has A NOT next to B?
AE, B, C, D, A
BE, A, C, D, B
CE, A, B, C, D
DE, B, A, C, D
Answer & Solution
Correct answer: B. E, A, C, D, B
1. C between A and D means A-C-D or D-C-A as a block.
2. Block placement after E: E, A, C, D, _ leaves B at end.
3. In E, A, C, D, B sequence, A is at position 2 and B at position 5; not adjacent.
4. Other options either violate the C-between rule or place A adjacent to B.
_Source: ICAI BoS Foundation Paper 3, Ch 11 'Seating', p.4_
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