Lesson eLearning

Rohit tosses a fair coin two times. Find the probability that at least one toss results in a head.

easy 2 marks Class 10 · Mathematics · Probability
Answer
3/4

The correct answer is 3/4 — Probability = favourable/total = 3/4 because each outcome is equally likely.

Step-by-step solution

  1. List all possible outcomes of two tosses: HH, HT, TH, TT (4 outcomes).
  2. Count the outcomes that contain at least one head: HH, HT, TH (3 outcomes).
  3. Probability = favourable/total = 3/4 because each outcome is equally likely.
Common mistake: Counting only the case with exactly one head and forgetting the case with two heads

Concept tested: Complementary probability

Published · How this solution was prepared and checked

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