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Bot GPT 3.5 ) = P(bouncy balls) + P(yo-yo)
Since bouncy balls and yo-yo are two disjoint events, we can simply add their individual probabilities.
P(bouncy balls) = 0.6
P(yo-yo) = 0.4
Therefore, P(bouncy balls or yo-yo) = 0.6 + 0.4 = 1.
So the probability of selecting either a bouncy ball or a yo-yo is 1 or 100%.