Probability Year 2

The question is:

Given that the biscuit is broken, find the probability that it was not made by machine K.

Does this mean the equation is:

P(broken) / p(not K)

or is it

P(not k) / p(broken)


I don't understand which part is the top value

its
p(not machine K | broken)
so
1 - p(machine K | broken)
The conditional is the usual
p(machine K | broken) = p(machine K & broken) / p(broken)
or an equivalent expression, depending on the question.