Step 1 :

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Mutually exclusive events :

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If E and F are mutually exclusive events,

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$\"\"$

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Step 2 :

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The events are $\"\"$ and $\"\"$ .

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If A and B are mutually exclusive events,

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in above equation.

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$\"\"$

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$\"\"$

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Solution :

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$\"\"$