Mathematics
Medium
Question
In how many different ways can four books A, B, C and D be arranged one above another in a vertical order such that the books A and B are never in continuous position?
A
9
B
12
✓ Official correct answer
C
14
D
18
Community credibility
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A
9
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B
12
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C
14
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D
18
No member explanations yet for this option.