# Probability calculator result problem

Hi, I started the Freecode Camp Scientific Computing with python. I went trough the videos and began completing the projects. I’m trying to finish the last one but I get an error from the last unit test, I get 0.257 instead of the 0.272 expected. I have been looking for an answer but didin’t find any solution.

here’s my code
and the traceback :

Sorry for the commented lines these are print I use to check on what’s going on.

Thanks to everyone making FreeCodeCamp possible !
Cheers

An error like this means you are not counting some draws that are good, so the bug has to be where you are counting good experiments in your `experiment()` function. If you take your code:

``````    for color in balls_drawn:
if (color in expected_balls) and (color not in colors):
if (balls_drawn.count(color) >= expected_balls[color]):
colors.append(color)
#print (color, expected_balls[color], balls_drawn.count(color))
#print (color, expected_balls[color])
#print (colors)
if (colors == expected_colors) or (colors == expected_colors.reverse()):
print("GOOD")
M += 1
break
``````

and add some `print()` statements:

``````    good = False
for color in balls_drawn:
if (color in expected_balls) and (color not in colors):
if (balls_drawn.count(color) >= expected_balls[color]):
colors.append(color)
#print (color, expected_balls[color], balls_drawn.count(color))
#print (color, expected_balls[color])
#print (colors)
if (colors == expected_colors) or (colors == expected_colors.reverse()):
# print("GOOD")
good = True
print(f"GOOD drawn: {balls_drawn} expected: {expected_balls}")
M += 1
break

if not good:
``````

You’ll get ouput like this:

``````BAD drawn: ['red', 'blue', 'blue', 'green'] expected: {'blue': 2, 'green': 1}
``````

which shows that your code missed a good draw. I would check how you are comparing the drawn balls and expected balls, especially the last conditional. Since there are more than two colors, I don’t think `colors` and `expected_colors` can be expected to be equal or to the other’s reverse.

Good luck.

Hi jeremy.a.gray thanks for your answer. Your were right my code was missing some good draws becaus I wasn’t comparing the right lists.