تشتري جانت عبوة من عصي الجبن بأطوار متعددة. هناك 15 عصى من جبنة تشيدر، و 30 من جبنة موزاريلا، و 45 من جبنة بيبر جاك. إذا قامت جانت باختيار عصا جبن عشوائياً، فما هي نسبة احتمال أن تكون بيبر جاك؟
أولاً: احسب العدد الإجمالي للشleckstics: 15 شيدر + 30 موزاريلا + 45 بيبر جاك = 90 شطيرة الحامض
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