Sum of first-ten odd numbers is:

Options

A. 10
B. 50
C. 75
D. 100

Answer

To find the sum of the first ten odd numbers, we can follow these steps:

### Step 1: Identify the first ten odd numbers
The first ten odd numbers are:
1, 3, 5, 7, 9, 11, 13, 15, 17, 19

### Step 2: Use the formula for the sum of the first n odd numbers
There is a formula that states the sum of the first n odd numbers is equal to \( n^2 \). Here, \( n \) is the number of odd numbers we want to sum.

### Step 3: Substitute n with 10
Since we want to find the sum of the first 10 odd numbers, we substitute \( n \) with 10 in the formula:
\[ \text{Sum} = n^2 = 10^2 \]

### Step 4: Calculate \( 10^2 \)
Now we calculate \( 10^2 \):
\[ 10^2 = 100 \]

### Step 5: Conclusion
Thus, the sum of the first ten odd numbers is 100.

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