2 rows of 24
3 rows of 16
4 rows of 12
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One row of eighteen people, eighteen rows of one person, nine rows of two people or two rows of nine people.
None. 2 pairs = 2*2 people So 4 rows of 2 pairs = 2*2*4 = 16 people. You have only 8.
If they can stand in rows of 5 the total number must be a multiple of 5. Also, if they can stand in rows of 6 the total number must be a multiple of 6. The smallest such number is the least common multiple of 5 and 6, which is 30. So there can by 6 rows of 5-in-a-row or 5 rows of 6-in-a-row.
2
3 items (or people) can line up in 6 different sequences. 6 items (or people) can line up in 720 different sequences.