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Counting and Basic Probability · Question 33 of 65

Question 33

EasyOriginal question

A bag contains 5 red, 3 blue and 2 green marbles. Kavya takes out one marble without looking. What is the probability that it is blue?

Options for question 33

Show the answer and explanation
CorrectNot quiteAnswer D

Correct answer: D

Explanation

  1. Total marbles =5+3+2=10= 5 + 3 + 2 = 10, all equally likely to be picked.

  2. Favourable outcomes: 3 blue marbles.

  3. Probability =310= \frac{3}{10}.

Worth noting

37\frac{3}{7} divides by the number of NON-blue marbles instead of the total. 13\frac{1}{3} treats the three colours as equally likely, and 710\frac{7}{10} is the chance of NOT blue.

Concept
Classical probability: favourable over total
Typical time
40 s
Your time
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