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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?
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The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?
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I just need number 2 everything else you can forget...
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