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 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 area of a sector of a circle with radius 14 cm and central angle 90°?

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If the cost price of an item is Rs. 400 and the selling price is Rs. 500, what is the profit percentage?

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

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If the perimeter of a square is 40 cm, what is the area of the square?

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If sin(θ) = 0.6 and θ is acute, what is cos(θ)?

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What is the sum of all odd numbers from 1 to 99?

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If a cone has a base radius of 3 cm and height of 4 cm, what is its slant height?

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If a rectangle has a length of 10 cm and a width of 6 cm, what is its perimeter?

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

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