Posted by rehan on Tuesday, October 5, 2010 at 12:26am.
A bag contains 100 bolts and 300 nuts 50% of each have been rusted 1 item is chosen at random.
Find the probability that chosen item z rusted or a bolt.

math  PsyDAG, Tuesday, October 5, 2010 at 10:56am
200/400 = probability of finding rusted object.
100/400 = probability of choosing a bolt
Eitheror probability found by adding individual probabilities.