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Permutations and Combinations - Data Intensity 1 :: Discussion
| 24. | 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 | |
| C. | 14 | |
| D. | 18 | |
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