The effect of global climate change on the US economy was investigated by researchers at Carnegie Mellon University. To gauge th
e opinions of the scientific community, the researchers west up several hypothetical scenarios. For one portion of the study, the scenarios were determined by varying perspectives on the abatement costs and climate change damages. Perspective on abatement cost was "optimist", "moderate", or "pessimist." Similarly, perspectives on climate change damages were "optimist", "moderate", or "pessimist." A. Determine the number of different scenarios possible, where a scenario is a combination of abatement cost perspective and climate change damage perspective. B. In another portion of the study, five of the scenarios were selected for further investigation. If the five scenarios were selected at random, how many different choices exist?
