Of course!
But that's what we're all doing here, since the variables & parameters are very much unknown.
To quantify things when so much is unknown is folly.
It would be like trying to find a meaningful number for the Drake Equation.
You've claimed it, but that is far from its being "established".
We don't know what possible paths & steps there are to going from inanimate to self-replicating to becoming a living thing.
Perhaps I wasn't clear, or I misunderstand you, but the number is objectively not zero.
This is demonstrated by many experiments on possible building blocks of life creation from naturally occurring processes.
An example.....
http://www.space.com/32503-artificial-comet-creates-life-building-blocks.html
Such chemical reactions must be accounted for in any probability calculation.
Of course you not required to show your work.
But to proffer a number without showing how you arrived at it doesn't allow the opportunity to examine the cromulence of your analysis.
Essentially, your answer appears to just pop out of a black box.
Even presuming your premises, It seems that you assume a single trial.
This would give the wrong answer.
And analogous question.......
What are the odds that I can flip a coin 20 times in a row, & have it come up heads each time?