You get an A on an algebra exam and attribute it to your strong math skills. Later in the semester you get a D on an exam in the same class. This time you attribute it to your instructor not having explained the concept well enough. This is an example of

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This is an example of the self-serving bias, which is when we attribute our successes to internal factors (like our own abilities) and our failures to external factors (like external circumstances or other people).

You Get an a on an Algebra Exam and Attribute