Let A = {1, 2, 3, 4} and B = {0, 3, 6, 8, 12, 15}. Consider a rule f (x) = x² - 1, x∈A, then show that f is a mapping from A to B.
Let's consider a rule and find an image of every element in A.
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We see that every element has an image and the image is unique.
It shows that is a mapping from A to B.
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