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

A triangle has angles 60°, 60°, and 60°. What type of triangle is it?

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

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If the radius of a circle is doubled, what happens to its area?

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What is the greatest common divisor (GCD) of 36 and 48?

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If x^2 + 4x + 4 = 0, what is the value of x?

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If a = 4 and b = 5, what is the value of (a+b)^2?

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A man rows downstream at 6 km/h and upstream at 4 km/h. What is the speed of the stream?

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What is the value of x if 3x + 7 = 16?

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A number is increased by 20% and then decreased by 20%. What is the net change?

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If the sum of the angles of a polygon is 1080°, how many sides does the polygon have?

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