# Exercise 3: Sum the Rows of a Matrix

Write code that calculates the array produced by summing the entries of each row of a matrix.

## We'll cover the following

## Problem statement

In this exercise, you’re given a nested array. Sum the entries in each row of the matrix and return an array containing these sums.

### Example

For example, consider the following array:

```
nested_array = [
[1, 2, 3],
[4, 5, 6],
[7, 8, 9]
]
```

We get the following output in return:

```
[6, 15, 24]
```

### Try it yourself

def sum_the_cols(nested_array)result = []# Start your code herereturn resultend

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