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প্রশ্নে বলা হচ্ছে যে, একটি ব্যাগে কিছু সাদা ও কালো রংয়ের বল রয়েছে। ব্যাগ হাতে পুনঃ প্রতিস্থাপন না করে পরপর দুটি সাদা বল উত্তোলনের সম্ভাব্যতা  1433 এখন প্রশ্ন হলো ঐ ব্যাগে সর্বোচ্চ 15 টি বলের ধারণ ক্ষমতা থাকলে দুটি কালো বল উত্তোলনের সম্ভাব্যতা কত?

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Given 1433 = 812 × 711 [Multiplying by 4] From the above question, we see total ball = 12 & number of white ball = 8 ∴ Number of black ball = 12-8=4 ∴ Required probability = 4c212c2 = 4 × 31 2× 11 = 111 Answer.

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