SOLUTION: Five identical green flags,4 identical red flags and 3 identical yellow flags are to be hanged on a row of 12 poles.In how many ways can those flags be arranged?

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Question 1088064: Five identical green flags,4 identical red flags and 3 identical yellow flags are to be hanged on a row of 12 poles.In how many ways can those flags be arranged?
Answer by Tatiana_Stebko(1539) About Me  (Show Source):
You can put this solution on YOUR website!
N=12%21%2F%285%21%2A4%21%2A3%21%29
Since 12%21=5%21%2A6%2A7%2A8%2A9%2A10%2A11%2A12, 4%21=1%2A2%2A3%2A4, 3%21=1%2A2%2A3
N=%285%21%2A6%2A7%2A8%2A9%2A10%2A11%2A12%29%2F%285%21%2A1%2A2%2A3%2A4%2A1%2A2%2A3%29=27720
Answer: 27720