Question

The sum of first 20 positive integer will be

Answer 1

Answer:

The sum of first 20 positive integers will be 210.

i hope it helps u........

Answer 2

Answer:

The sum of first 20 positive integer will be 210.

Step-by-step explanation:

Given : First 20 Positive Integers.

To Find : Sum of first 20 Positive Integers.

Solution :

Since we know that the sum of first n positive integers = $\frac{n \cdot (n+1)}{2}$

So the sum of first n = 20 positive integers =

                                    =  $\frac{20\ \text{x} \ (20+1)}{2}$

                                    = $\frac{20 \ \text{x} \ 21}{2}$

                                    = 10 x 21

                                    = 210

Hence the sum of first 20 positive integers is 210 .

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