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  1. Chapter 13 Class 12 Probability
  2. Serial order wise

Transcript

Ex 13.1, 3 If P (A) = 0.8, P (B) = 0.5 and P(B|A) = 0.4, find (i) P(A โˆฉ B)P(A) = 0.8 , P(B) = 0.5 & P(B|A) = 0.4 Now, we know that P(B|A) = (๐‘ƒ(๐ต โˆฉ ๐ด))/(๐‘ƒ(๐ด)) 0.4 = (๐‘ƒ(๐ด โˆฉ ๐ต))/(๐‘ƒ(๐ด)) 0.4 = (๐‘ƒ(๐ด โˆฉ ๐ต))/(0. 8) P(A โˆฉ B) = 0.4 ร— 0.8 P(A โˆฉ B) = 0.32 Ex 13.1, 3 If P (A) = 0.8, P (B) = 0.5 and P(B|A) = 0.4, find (ii) P(A|B)P(A|B) = (๐‘ƒ(๐ด โˆฉ ๐ต))/(๐‘ƒ(๐ต)) = 0.32/0.5 = 32/50 = 0.64 โˆด P(A|B) = 0.64 Ex 13.1, 3 If P (A) = 0.8, P (B) = 0.5 and P(B|A) = 0.4, find (iii) P(A โˆช B)P(A โˆช B) = P(A) + P(B) โ€“ P(A โˆฉ B) = 0.8 + 0.5 โ€“ 0.32 = 1.3 โ€“ 0.32 = 0.98 โˆด P(A โˆช B) = 0.98

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.