Transcript The Syllogism

The Sacred 3 of Detective Stories
1.
2.
3.
MEANS
MOTIVE
OPPORTUNITY
The Syllogism- formal argument
consisting of a major and a minor premise of
a conclusion.
Sherlock Holmes
What can you conclude

“It is customary for pawnbrokers in England,
when they take a watch to scratch the
numbers of the ticket with a pin-point upon
the inside of the case. It is more handy than a
label as there is no risk to the number being
lost or transposed. There are no less than four
such numbers visible to my lens on the inside
of the case.
Inference

--that your brother was often at low water (in
need of money). Secondary inference—that
he had occasional bursts of prosperity or he
could not have redeemed the pledge.”
(Pledge—the agreement made on pawning the
watch)
The syllogism
1.
2.
Numbers scratched on the inside of watch
cases are the marks of pawnbrokers in
London.
There is a number scratched on the inside of
this case.
Therefore, it is a mark made by a pawnbroker In
England.
Syllogism
1.
2.
Freshman at OBHS are required to wear
yellow t-shirts.
Manuel is a freshman at OBHS
Therefore…?
Syllogism
1.
2.
The tropical smoothies at Paradise Deli are
made with pineapple juice.
This is a tropical smoothie from Paradise
Deli
Therefore…..
Syllogism
1.
2.
All Go-Alpine snow mobiles are equipped
with first aid kits.
My uncle bought a Go-Alpine snowmobile.
Therefore…
Complications??? Yes or No

I visit OBHS and I see a student wearing a
yellow shirt
Therefore I can conclude that the student is a
freshman.
Complications??? Yes or No
You are on the slopes and someone needed a first
aid kit.
You’re only chance to help him is to find an
Alpine-go snow mobile?
Complications??? Yes or No
Male Cardinals have red feathers.
This bird is a male cardinal.
Therefore, it has red feathers.
Syllogism
Among Potato Chip products, it is said that
Ruffles have ridges.
By George, this potato chip has ridges.
Therefore this potato chip must be a Ruffles.
Syllogism
All Nike Basketball shoes have a swoosh on the
side.
This basketball shoe is a Nike.
Therefore this shoe has a swoosh on the side.
Syllogism
The formula for making coca cola is a secret.
This soda was made from a secret formula.
Therefore, it must be a Coca Cola.
Syllogism
Usher sings a song called “Yeah.”
The song that is playing on the radio is called
“Yeah.”
Therefore the singer must be Usher.
Syllogism
All bay horses have black manes.
Champ is a bay horse.
Therefore Champ has a black mane.
Syllogism
Some Ford SUVs are equipped with DVD
players.
My SUV has a DVD
Therefore it must be a Ford
Syllogism
Only US $1 bills have a picture of George
Washington on them
Here’s a bill with a picture of George
Washington on it.
It’s got to be a US $1 bill.