Question

In tossing a coin, the chance of throwing head and tail alternatively in 3 successive trials is

• A. $\frac{1}{8}$
• B. $\frac{1}{6}$
• C. $\frac{1}{5}$
• D. $\frac{1}{4}$

Answer 1

Answer: (D)

$\frac{1}{4}$

Total sample space is $HHH,HHT,HTH,HTT,THH,THT,TTH,TTTi.e.,8$.

Here, head and tail alternatively occurs in $2$ occasions only.

Therefore, probability will be

$=\frac{2}{8}$

$=\frac{1}{4}$

Hence, this is the answer.