The probability of getting a head when a coin is tossed once is :

Options

A. `(1)/(2)`
B. 1
C. `(1)/(3)`
D. None of these

Answer

To find the probability of getting a head when a coin is tossed once, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Sample Space**:
When a coin is tossed, there are two possible outcomes: Heads (H) and Tails (T). Therefore, the sample space (S) can be represented as:
\[ S = \{H, T\} \]

2. **Count the Total Outcomes**:
The total number of outcomes in the sample space is 2 (one for heads and one for tails):
\[ \text{Total Outcomes} = 2 \]

3. **Identify Favorable Outcomes**:
The favorable outcome for getting a head is just one (H). Thus:
\[ \text{Favorable Outcomes} = 1 \]

4. **Calculate the Probability**:
The probability (P) of an event is calculated using the formula:
\[ P(\text{Event}) = \frac{\text{Number of Favorable Outcomes}}{\text{Total Outcomes}} \]
Substituting the values we have:
\[ P(\text{Head}) = \frac{1}{2} \]

5. **Conclusion**:
Therefore, the probability of getting a head when a coin is tossed once is:
\[ \frac{1}{2} \]