There is no difference in the approach (and both questions are past exam questions).
In question 3, the probable outcome is that they will have to pay $3,000 and so according to the standard the provision is $3,000.
In question 4, the probable outcome (because it is more than 50% probability) is that they will lose the case and therefore have to pay $100,000. In addition they will have to pay the lawyer $10,000. So a total of $110,000 is needed as a provision.