Probability that both will find oil is A*B and probability that at least one will success is A+B
Two independent measurement techniques are used to evaluate the success of failure of drilling an oil well.
The first technique has a 30% probability of resulting in a successful well.
The second technique has a 20% probability of resulting in a successful well.
What is, and how do you calculate, the probability of success in an area where these two techniques overlap?