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प्रश्न
In how many ways 5 persons can be seated in a row?
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उत्तर
Number of persons = 5
| 5 | 4 | 3 | 1 |
5 persons can be arranged among themselves in 5! ways
(i.e) 5 × 4 × 3 × 2 × 1 = 120 ways
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