Deductive Reasoning. By. Mr. Kass. Deductive Reasoning Is…. Deductive reasoning is when you start from things you assume to be true, and draw conclusions that must be true if your assumptions are true. . For Example All dogs have a tail. Buddy is a dog. Therefore Buddy has a tail.
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By. Mr. Kass
All dogs have a tail.
Buddy is a dog.
Therefore Buddy has a tail.
Sherlock Holmes could help solve a mystery by making inferences. If Holmes saw a pack of cigarettes by a victim (the victim did not smoke), Holmes can make the assumption that the killer is a smoker.
George is not from M.I.T.
Therefore George is not an Engineer
Everybody from Texas is a cowboy
Scott is from Texas
Scott is a cowboy
My sociology teacher told us that those of us who grew up in America in the twentieth century, with all of its greed, bigotry, and abuse of power inherited a sickness. Well, if I’m sick, I guess I don’t have to go to school today.
“Ugggh, I don’t know…”
(My Hero. Ralph Wiggum from the Simpsons)
Using laws and rules to make assumptions
The law of gravity means everything that goes up must come downI threw a baseball in the airThat means the baseball must come down.
To be elected President you must obtain at least 270 electoral votesGeorge Bush won 287 electoral votesTherefore George Bush is the President.
Scott has a case of soda in his house since there are 13 cans of soda left I deduce that Scott has drank 11 cans of soda.
When I see like in a sentence, I deduce that it is a simile.
And many more...
An attorney states that his client is innocent because the crime victim was hit by a car. Since his client does not have a license. He can deduce that his client is innocent.