The sum of first 20 odd natural numbers is equal to :

Options

A. 210
B. 300
C. 400
D. 420

Answer

To find the sum of the first 20 odd natural numbers, we can use the formula for the sum of the first \( n \) odd natural numbers, which is given by:

\[ \text{Sum} = n^2 \]

where \( n \) is the number of odd natural numbers we want to sum.

### Step-by-Step Solution:

1. **Identify the value of \( n \)**:
- We are asked to find the sum of the first 20 odd natural numbers, so \( n = 20 \).

2. **Apply the formula**:
- According to the formula, the sum of the first \( n \) odd natural numbers is \( n^2 \).
- Therefore, we calculate:
\[ \text{Sum} = 20^2 \]

3. **Calculate \( 20^2 \)**:
- Performing the calculation:
\[ 20^2 = 400 \]

4. **Conclusion**:
- The sum of the first 20 odd natural numbers is \( 400 \).

### Final Answer:
The sum of the first 20 odd natural numbers is \( 400 \).

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