Question 1184366
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It's a trick question, and therefore a bad one for a student who is just learning about permutations and combinations.<br>
The key to getting the answer 6 is that the problem says she is arranging A PARTICULAR GROUP OF THREE CARDS in a line.<br>
Therefore the three cards to be arranged have already been selected; and the number of ways of arranging them is 3*2*1=6.<br>