# Sum of n numbers

Easy

25

1

85.4% Acceptance

In this lab, you will write a Python function named `sum_of_n`

. This function should calculate the sum of all integers from 1 up to a given positive integer `n`

.

**Function Requirements:**

- The function should be named
`sum_of_n`

. - It should take one argument,
`n`

, which is a positive integer. - The function should return the sum of all integers from 1 to
`n`

.

**Examples:**

- If you call
`sum_of_n(3)`

, the function should return`6`

, as 1 + 2 + 3 = 6. - For
`sum_of_n(5)`

, the expected output is`15`

, since 1 + 2 + 3 + 4 + 5 = 15.

**Task:**

Write the `sum_of_n`

function following the above requirements. Ensure your function passes all the challenges by calculating the correct sums for different values of `n`

.