Prbability Calculator error -unsupported operand

I have one test that is yielding an error. It says there is a TypeError for subtraction between a tuple and a list. But I only have one instance of subtraction which works fine. I’m seeking advice on where this error might be coming from.

boilerplate-probability-calculator - Replit

return('Probability: ', probability)
Here you create and return a tuple. Please read the description again on what you are supposed to return.

This certainly helped get me over that hump. Thank you.