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مالذي يعنيه مصطلح (الوزة السوداء)؟

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Question added by AHMED AL-ZAIDYYAH , sports club manager , 3 days
Date Posted: 2015/04/30
sameh عبدالعظيم
by sameh عبدالعظيم ,  Accountant , IDSC

 تشير إلى صعوبة التنبؤ بالأحداث النادرة 

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