Topic Details (Notes format)

How to Solve Conditional Probability Problems

Subject: Mathematics

Book: Maths Mastery

Conditional probability P(A|B) measures the likelihood of A given B has occurred, computed as P(A ∩ B) ÷ P(B). For example, if the probability of it raining and your friend carrying an umbrella is 0.30, and the probability of your friend carrying an umbrella is 0.50, then P(Rain|Umbrella) = 0.30 ÷ 0.50 = 0.60. Conditional probability arises in medical testing (positive test given the condition), machine learning (predictive models), and daily logic (likelihood of an outcome given partial info). Mastering it refines your reasoning and real-life decision-making based on evolving evidence.

Practice Questions

What is the sum of the first 50 positive integers?

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If the length of a rectangle is doubled and the width is halved, what is the change in area?

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A train 120 meters long is moving at a speed of 54 km/h. How long will it take to pass a pole?

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If the angles of a triangle are in the ratio 2:3:4, what is the measure of the largest angle?

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What is the square root of 0.25?

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If a square has a perimeter of 64 cm, what is its area?

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What is the cube of 4?

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If the product of two numbers is 120 and their sum is 26, what are the numbers?

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What is the value of x if log(x) + log(4) = log(32)?

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The area of an equilateral triangle with side length 6 cm is:

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