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

If 5x - 2 = 13, what is the value of x?

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If 3x = 81, what is the value of x?

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If 2x - 3 = 7, what is the value of x?

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A train 150 m long passes a pole in 15 seconds. What is its speed?

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What is the square root of 144?

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If log(100) = 2 and log(10) = 1, what is log(1000)?

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What is the area of an equilateral triangle with side length 10 cm?

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The perimeter of a rectangle is 40 cm, and its length is 12 cm. What is its width?

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The sum of the squares of two consecutive integers is 145. What are the integers?

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The LCM of 12 and 15 is:

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