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A teacher wants to select 4 students from a class of 20 to represent the school at a conference. She writes each student's name on a slip of paper, mixes them in a hat, and draws 4. This is:
A teacher wants to select 4 students from a class of 20 to represent the school at a conference. She writes each student's name on a slip of paper, mixes them in a hat, and draws 4. This is: