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(1) Let A be the set of people alive on earth. For each relation dened below, determine if it is an equivalence relation on A.

(1) Let A be the set of people alive on earth. For each relation dened below, determine if it is an equivalence relation on A. If it is, describe the equivalence classes. If it is not, determine which properties of an equivalence relation fail.

(a) aH b a and b are the same height.

(b) aGb a and b have a common grandparent.

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