Question

The probability of getting atleast two heads when an unbiased coin is tossed three times is

• A. $\frac{1}{4}$
• B. $\frac{1}{3}$
• C. $\frac{1}{2}$
• D. $\frac{1}{8}$

Answer 1

The correct option is C $\frac{1}{2}$

For getting at least two heads in tossed three times $=(H,H,T),(H,T,H),(T,H,H),(H,H,H)$
The probability of getting at least two heads $=\frac{4}{2^3}=\frac{1}{2}$