7!/2! = 7*6*5*4*3 = 2520
7!/2! = 7*6*5*4*3 = 2520
7!/2! = 7*6*5*4*3 = 2520
7!/2! = 7*6*5*4*3 = 2520
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18
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There are four different groups of three, each of which can be arranged in six different ways so your answer is 24.
raisesiresrises------------------------------------They can be arranged in 5!=120 ways.
81