Ruben's mental shortcut is an example of a. stereotype.
In the field of English linguistics, the word stereotype is used o refer to a specific cliche or generalization about a certain group of people. A stereotype is a belief that is present in the minds of people in relation to other people or things.
In the case above, Ruben has a generalized belief that Asians are naturally good in mathematical as well as science subjects. Hence, this generalized belief of Ruben is a stereotype that is built in his mind about the Asian people. A stereotype might always not be correct.
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