Logistic equation with or without brackets is correct?

Question

I am coding a logistic function where the function reads: Now to calculate the % chance of an event happening I have been using:

 e^x/1+e^x

now my answer changes significantly depending on if I use:

e^x/1+e^x or e^x/(1+(e^x))

which of these two is correct ?

thanks Hyflex

Answer 1

Precedence question. The correct, unambiguous answer is,

(e^x)/(1+(e^x))