You Have 40 Different Books (20 Math Books, 15 History

question 42

Short Answer

you have 40 different books (20 math books, 15 history books, and 5 geography books).
-You pick two books at random, one at a time. What is the probability that the two books are from different disciplines?

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Definitions:

UCR

Uniform Crime Reporting; a statistical program designed to collect and analyze data on crime reported to law enforcement agencies in the United States.

UCS

Stands for Unconditioned Stimulus in classical conditioning, an event that elicits a natural, reflexive response.

CR

In classical conditioning, the conditioned response is the learned reaction to a conditioned stimulus.

CS

Conditioned Stimulus, a previously neutral stimulus that, after becoming associated with an unconditioned stimulus, eventually comes to trigger a conditioned response in classical conditioning.