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In how many ways can eight people line up from left to right for a group photo?

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Number of ways 8 people line up is the number of ways in which they can be arranged among themselves and this is nothing but 8 factorial.

8! = 8 × 7 × 6 × 5 × 4 × 3 × 2 × 1 = 40,320

Answer: Therefore, eight people can line up in 40,320 ways.
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