Ana is going to have a birthday party at the local ice-skating rink. She is only going to invite girls from her class. There are seven girls in the class, but her parents say she can only invite four people. How many combinations of friends can she invite?

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Ana is going to have a birthday party at the local ice-skating rink. She is only going to invite girls from her class. There are seven girls in the class, but her parents say she can only invite four people. How many combinations of friends can she invite?