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I apologise about the proof-reading-like questions which annoy some of the experts here. But from them, I learn and apply in future. I have the following sentence:
There is a small probability that something bad will happen. To get an insight on such probability
Is it:
on such probability
or
on such a probability
Either of these is grammatically fine.
In this context, however, I don't think I'd use such at all. You're not speaking about a probability like that one, which is what such implies—you're talking specifically about that particular probability, the probability that something bad happens. And that's what I'd say:
There is a small probability that something bad will happen. To get an insight on that probability . . .
Many times, ELLers try to use the word such as you have done.
Very often, it's better to use to phrase it like this:
[...] to obtain or gain insight into a probability such as that/this/.
Such a probability works better at the beginning of a sentence:
Such a probability [previously defined in another sentence] is not a likely scenario.
for quick reference: rather than use "such a [noun]",it's better to use: a/an [noun] such as this/that/these/those.
A probability such as this is not a likely outcome.
