Subject: General Aptitude · Chapter: Probability · Exam: · Marks: · Difficulty:
Two unbiased coins are tossed. What is the probability of getting at most one head ?
Answer
Answer (as printed):
Explanation
Here $S=\{HH, HT, TH, TT\}$. Let $E=$ event of getting at most one head. $\therefore E=\{TT, HT, TH\}$. $\therefore P(E)=\frac{n(E)}{n(S)}=\frac{3}{4}$.
Explanation as extracted from the printed page; notation may be imperfect.