Question

What will be the sum of the first 21 consecutive odd numbers?

• A. 144
• B. 441
• C. 244
• D. 442

Answer 1

The correct option is B 441

We know that the sum of consecutive odd numbers is equal to the number of consecutive odd numbers multiplied by itself.

Here we have the first 21 consecutive odd numbers.
So, the sum of the first 21 consecutive odd numbers is 21 multiplied by itself. i.e 21 times 21 = 21 ×21= 441

So, the sum of the first 21 consecutive odd numbers = 441