$\"\"$

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The probability of baseball P(baseball)

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$\"\"$ ( $\"\"$ )

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The probability of football P(football)

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$\"\"$ ( $\"\"$ ) $\"\"$

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$\"\"$ (Mutually exclusive events)

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$\"\"$ (Substitute)

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$\"\"$ (Add)

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The probability is $\"\"$ or about 84%. $\"\"$

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The probability is $\"\"$ or about 84%.