Question

What is the probability of getting 3 heads when 3 unbiased coins are tossed simultaneously?

• A. $\frac{2}{5}$
• B. $\frac{1}{5}$
• C. $\frac{1}{8}$
• D. $\frac{3}{8}$

Answer 1

The correct option is C $\frac{1}{8}$

When 3 unbiased coins are tossed simultaneously, the outcomes are{HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}
Total number of outcomes = 8
Number of outcomes that favours all 3 heads = {HHH}=1
$\therefore \text{probability}=\frac{1}{8}$