Suppose the second derivative of a function f is f" (z) 0 (-∞, 1) U (1, 3) U (5,00) ○ (3,5) O (1,3) U (3,5) (-∞, 1) U (3,5) (1, 3) U (5, ∞) (-5), -3) (21)² On what interval is the graph of f concave downward?

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