Question

find sum of first 80 odd numbers​

Answer 1

Answer:

1600. is the sum of first 80 odd no

Answer 2

Answer:

6400

Step-by-step explanation:

This is a simple Arithmetic Progression.

First term (a) = 1

Number of terms (n) = 80

Difference between 2 consecutive terms (d) = 2

Now we can use the formula

$Sum = (2a + (n - 1) d) \frac{n}{2}$

$Sum = (2 * 1 + (80 - 1) * 2) \frac{80}{2}$

On solving this, you'll get

Sum =  6400

Hope this helps!