Question

When an unbiased coin is tossed thrice the probability of getting heads all the time is :

• A. $\frac{1}{8}$
• B. $\frac{1}{6}$
• C. $\frac{2}{8}$
• D. $\frac{1}{5}$

Answer 1

Answer: (A)

$\frac{1}{8}$

Probability of getting a head on one toss of the coin $\frac{1}{2}$
Probability of getting a head every time if the coin is tossed three times

$=\frac{1}{2}\times \frac{1}{2}\times \frac{1}{2}$

$=\frac{1}{8}$