Question

Find the sum of first 10 consecutive odd numbers.

• A. $1+3+5+7+9+11+13+15+17+19=100$
• B. $1+3+5+7+9+11+13+16+17+19=101$
• C. $1+3+5+7+10+11+13+15+17+19=101$
• D. $1+3+6+6+9+11+13+15+17+19=100$

Answer 1

The correct option is A $1+3+5+7+9+11+13+15+17+19=100$

The sum of first 10 consecutive odd numbers is $1+3+5+7+9+11+13+15+17+19$
Since, we know the formula for sum of consecutive odd numbers = $n^2$
So, $n=10$, Sum $=(10{)}^2=100$