Question

Study the following pattern.
$1=1^2$
$1+3=2^2$
$1+3+5=3^2$
$1+3+5+7=4^2$
and so on.
What is the sum of the first 10 odd numbers?

• A. 20
• B. 100
• C. 10
• D. 200

Answer 1

The correct option is B 100

The given pattern is:
$1=1^2$
$1+3=2^2$
$1+3+5=3^2$
$1+3+5+7=4^2$
and so on.
The sum of the first 10 odd numbers is:
$1+3+5+7+9+11+13+15+17+19={10}^2=100$