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Let A and E be two events with positive ...

Let A and E be two events with positive probabilites
Statement 1 : `P(E//A)ge P(A//E) P(E)`
Statement 2 : `P(A//E)ge P(A cap E)`

A

both statements are true

B

both statements are false

C

statement 1 is true, statement 2 is false

D

statement 1 is false, statement 2 is true

Text Solution

AI Generated Solution

The correct Answer is:
To solve the problem, we need to analyze the two statements given about the events A and E with positive probabilities. ### Step 1: Understand the Definitions We start with the definitions of conditional probability: - The conditional probability of E given A is defined as: \[ P(E | A) = \frac{P(E \cap A)}{P(A)} \] - The conditional probability of A given E is defined as: \[ P(A | E) = \frac{P(A \cap E)}{P(E)} \] ### Step 2: Write the Equations From the definitions, we can write: 1. \( P(E | A) = \frac{P(E \cap A)}{P(A)} \) (Equation 1) 2. \( P(A | E) = \frac{P(A \cap E)}{P(E)} \) (Equation 2) ### Step 3: Divide the Two Equations Now, we divide Equation 1 by Equation 2: \[ \frac{P(E | A)}{P(A | E)} = \frac{\frac{P(E \cap A)}{P(A)}}{\frac{P(A \cap E)}{P(E)}} \] This simplifies to: \[ \frac{P(E | A)}{P(A | E)} = \frac{P(E \cap A) \cdot P(E)}{P(A \cap E) \cdot P(A)} \] Since \( P(E \cap A) = P(A \cap E) \), we can cancel these terms: \[ \frac{P(E | A)}{P(A | E)} = \frac{P(E)}{P(A)} \] ### Step 4: Analyze Statement 1 From the equation derived, we can express: \[ P(E | A) \geq P(A | E) \cdot P(E) \] This means that Statement 1 \( P(E | A) \geq P(A | E) \cdot P(E) \) is true. ### Step 5: Analyze Statement 2 Now, we analyze Statement 2: \[ P(A | E) \geq P(A \cap E) \] Using the definition of conditional probability: \[ P(A | E) = \frac{P(A \cap E)}{P(E)} \] Since \( P(E) > 0 \) (as given), we can multiply both sides by \( P(E) \): \[ P(A | E) \cdot P(E) \geq P(A \cap E) \] This implies: \[ P(A | E) \geq P(A \cap E) \] Thus, Statement 2 is also true. ### Conclusion Both statements are true: 1. Statement 1: True 2. Statement 2: True
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