यदि P(A)=1/3, P(B)=1/2 और P(AB)=1/4 है, तो P(A|BC) का मान क्या है?

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NDA-I (Mathematics) Official Paper (Held On: 13 Apr, 2025)
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  1. 1/8
  2. 3/8
  3. 5/8
  4. 7/8

Answer (Detailed Solution Below)

Option 2 : 3/8
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गणना:

दिया गया है,

हमें P(B | AC) की प्रायिकता, अर्थात A के घटित न होने पर B के घटित होने की प्रायिकता की गणना करने की आवश्यकता है

बेज़ प्रमेय और सप्रतिबंध प्रायिकता के सूत्र का उपयोग करने पर:

मानों को प्रतिस्थापित करने पर::

अंश को सरल करने पर::

हर को सरल करने पर::

अंतिम व्यंजक है:

इसलिए, सही उत्तर विकल्प 2 है।

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