Logic

Answer the following questions at your table.

1. Imagine you are in a room with 3 switches. In an adjacent room there are 3 lamps (let's say in lamps which are on a regular table), each switch belongs to one lamp. All are off at the moment. It is impossible to see from one room to another. No help from anybody else is allowed.How can you find out which switch belongs to which bulb, if you may enter the room with the bulbs only once?


2. A table tennis ball (= a ping pong ball) fell into a tight deep pipe - it is about 30 cm long, buried in concrete pavement, having firm metal bottom, only 1 cm of the pipe is above the ground so it cannot be moved. The pipe was only a bit wider than the ball, so you cannot use your hand.How would you take it out, with no damage?


3. How can you throw a ball as hard as you can and have it come back to you, even if it doesn't hit anything, there is nothing attached to it, and no one else catches or throws it?

4. A man lives on the tenth floor of a building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator - or if it was raining that day - he goes back to his floor directly. Otherwise, he goes to the seventh floor and walks up three flights of stairs to his apartment. How come?


5. A farmer is standing on one bank of a river, with a fox, a chicken, and a bag of grain. He needs to get to the other side of the river, taking the fox, the chicken, and the grain with him.
   However, the boat used to cross the river is only large enough to carry the farmer and one of the things he needs to take with him, so he will need to make several trips in order to get everything across.
   In addition, he cannot leave the fox unattended with the chicken, or else the fox will eat the chicken; and he cannot leave the chicken unattended with the grain, or else the chicken will eat the grain. The fox is not particularly partial to grain, and may be left alone with it.
   How can he get everything across the river without anything being eaten?

Syllogisms:

Premise 1: All humans are mortal

Premise 2: Einstein was a human

Conclusion: Einstein was mortal

 

Premise 1: All male teachers at SWA are handsome Olympic athletes

Premise 2: Mr Brian is a male teacher at SWA

Conclusion: Therefore, Mr Brian is a handsome Olympic athlete!

 

P1: Time is money

P2: Unemployed people have a lot of time

C: Therefore, unemployed people are rich!

 

Come up with two syllogisms and post them as a comment on my blog