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Question 2 13 Find the least upper bound (if it exists) and the greatest lower bound (if it exists) for the set } - 5, - 17 3 4 .. " . . . . a) O lub = -5 ; glb = -6 b) O lub = -4; glb = -5 c) O no lub ; glb = -5 d) O lub = -3 ; glb = -5 e) O lub and glb do not exist. Question 3