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In how many ways can 4 persons be arranged in a row?

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In how many ways can 4 persons be arranged in a row?

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4 persons are to be arranged in a row.

∴ n = 4, r = 4

∴ Total permutations = 4P4

= 4! (∵ nPn = n !)

= 4 × 3 × 2 × 1

= 24

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