Correction ex 13
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The question appears to be a request for help with a specific exercise or problem labeled as 'ex 13'. Without additional context, it's unclear what subject or topic this exercise is related to, but it suggests a need for assistance in correcting or solving it.
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The search results do not directly provide sufficient information about 'Correction ex 13'. If you have specifics about the exercise or its source, such as a textbook name, it would help clarify the exact content you're looking for.
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