## The Quiz

You have these numbers at your disposal:

```
1, 3, 5, 7, 9, 11, 13, 15
```

use them, with repetition, to make the following expression evaluate to true:

```
__ + __ + __ + __ + __ = 30
```

…

## Solution

What I naturally did was:

```
def all_combos(arr, result):
""""""
if len(result) == 5:
if sum(result) == 30:
print result
else :
for x in arr:
new_result = result[:]
new_result.append(x)
all_combos(arr, new_result)
available_numbers = range(1, 16)[::2]
all_combos(available_numbers, [])
```

Which gave no solutions at all…

So I raged at the person who gave the question, and they replied:

Dude, there is no way you can add odd numbers an odd number of times, and get an even number. That’s the real solution.

## Conclusion

Ever heard of the “Helicopter Approach”? Well, you should read about it.