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An urn contains 3 red, 5 blue, and 2 green marbles. A marble is drawn at random. What is the probability that the marble is red?

easy MCQ 1 mark Class 10 · Mathematics · Probability
  1. 1/5
  2. 3/10
  3. 1/3
  4. 3/8
Answer
3/10

The correct answer is 3/10 — Probability = favourable/total = 3/10 because each marble is equally likely to be drawn.

Step-by-step solution

  1. Count the total number of marbles: 3+5+2 = 10.
  2. Identify the number of favourable outcomes (red marbles): 3.
  3. Probability = favourable/total = 3/10 because each marble is equally likely to be drawn.
Common mistake: Using an incorrect total number of marbles as denominator

Concept tested: Simple probability

Published · How this solution was prepared and checked

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