Multiple Choice
A biopsychologist is interested in how quickly rats learn a complicated maze.He puts 5 rats,labeled A,B,C,D,and E,in a box.He wants to run two of the rats through a maze,one rat at a time.How many subsets of 2 rats could he choose to run through the maze if order does NOT matter?
A) 10
B) 15
C) 20
D) 40
Correct Answer:
Verified
Correct Answer:
Verified
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