Final answer:
The New Rhetoricians developed the idea of probability in rhetorical theory, drawing on concepts proposed by Aristotle and further elaborated by Cicero.
Explanation:
The New Rhetoricians developed the idea of probability as a touchstone of their rhetorical theory. This concept focused on using probability to enhance persuasive communication strategies.
Aristotle, a renowned ancient Greek philosopher, proposed fundamental concepts of rhetoric, including the importance of persuasive speech and communication strategies.
Cicero, a Roman orator, further expanded on rhetorical theories, outlining the five canons of rhetoric, which encompassed various aspects of effective speech delivery and organization.
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