1. 123
2. 132
3. 231
4. 213
5. 321
6. 312
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Answer: 6 There are 3 choices for the first kid, 2 for the remaing kids and then only 1 space left for the kid at the end of the line. 3x2x1=6 ways.
for the first student in the line there are 10 choices, then for the second 9 choices left, for the third 8 choices left and so on... So it's 10x9x8x7x6x5x4x3x2x1 = 3628800
13!/[(4!)(3!)(6!)] = 60060
5x4x3x2x1=120
120