An Unkindness of Ravens An Unkindness of Ravens An Unkindness of Ravens is a novel by British crime-writer Ruth Rendell. It was first published in 1985, and features her popular protagonist Inspector Wexford, and is the 13th entry in the series. On American publication, it was shortlisted for the MWA Edgar Award, alongside another Rendell novel, "The Tree of Hands", meaning she has the remarkable distinction of being one of only two authors in the award's history to have had "two" novels on the shortlist in any one year (the other being Charlotte Armstrong). "Ravens" was adapted as a play by theatre professor Joel
Collectively exhaustive events or not. For example, tossing a particular biscuit for a group of several dogs cannot be repeated, no matter which dog snaps it up. One example of an event that is both collectively exhaustive and mutually exclusive is tossing a coin. The outcome must be either heads or tails, or p (heads or tails) = 1, so the outcomes are collectively exhaustive. When heads occurs, tails can't occur, or p (heads and tails) = 0, so the outcomes are also mutually exclusive. The term "exhaustive" has been used in the literature since at least 1914. Here are a few examples: