যদি A এবং B দুটি ঘটনা হয় যেমন P(A) ≠ 0 এবং P(B | A) = 1, তাহলে

  1. B ⊂ A
  2. B = ϕ 
  3. A ⊂ B
  4. উপরের কোনোটিই নয় 

Answer (Detailed Solution Below)

Option 3 : A ⊂ B
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ধারণা:

  • \(\rm P(A|B) = \frac {P(A \;∩ \; B)}{P(B)}\)
  • \(\rm P(B|A) = \frac {P(A \;∩ \; B)}{P(A)}\)
  • A ⊂ B = সঠিক সাবসেট: A এর প্রতিটি উপাদান B তে রয়েছে, কিন্তু B এর আরও উপাদান রয়েছে।
  • ϕ = খালি সেট = {}

 

গণনা:

প্রদত্ত: P(B/A) = 1

\(\rm P(B|A) = \frac {P(A \;∩ \; B)}{P(A)} = 1\)

⇒ P(A ∩ B) = P(A)

⇒ (A ∩ B) = A

F1  Aman.K 20-04-2020 Savita D1

সুতরাং, A এর প্রতিটি উপাদান B তে রয়েছে, তবে B এর আরও উপাদান রয়েছে।

∴ A ⊂ B

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