SOLUTION: How many unique ways can 10 people fit on a 4-person park bench?

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Question 319360: How many unique ways can 10 people fit on a 4-person park bench?
Answer by Edwin McCravy(20060) About Me  (Show Source):
You can put this solution on YOUR website!
10 things, Position 4
10P4 = %2810%2A9%2A8%2A7%29%2F%284%2A3%2A2%2A1%29 = %2810%2A9%2Across%288%29%2A7%29%2F%28cross%284%29%2A3%2Across%282%29%2A1%29 = %2810%2A9%2A7%29%2F3 = %2810%2A%22%22%5E3%2Across%289%29%2A7%29%2Fcross%283%29 = 10%2A3%2A7=210