These phrases mean there is little or no possibility of something happening, although they have slightly different nuances.
- 0% chance = no chance
- 3% chance = fat chance
- 5% chance = slim chance
I went for a job interview today but I have fat chance of getting it; there was no chance I could get the job; there was only a slim chance I could get the job.
Do you think the rookie will make it this year? No chance!
We often talk about “probability” (= how much chance something is likely to happen). It is always good to have a variety of expressions to convey different meanings and nuances.
Good luck and Happy English Learning!