Here's a look at the answers from the problems mentioned earlier.
Problem 1: Ball Bearings - click here
Weigh two ball-bearings from A and one from B. If the combined weight is three ounces, then you know that C is defective. If the combined weight is 3.2 ounces, you know that A is defective. If the combined weight is 3.1 ounces, you know that B is defective.
Problem 2: Light Switch - click here
Turn two of the switches on, say switch A and switch B. Leave them on for a few mintutes. Then turn switch B off. Run upstairs into the room. If the light is on, switch A controls the light. If it is off, feel the bulb. If it is still warm, then switch B controls the light; if it is not warm, then switch C controls the light.
Problem 3: Firing Squard - click here
After one minute man 3 yells out that he is wearing a black hat. The firing squad lowers their weapons and releases the men. The others obviously are relieved and thankful, but curious as to how he was so certain. He calmly replies that deduction was the key. Man 3 deduced the following:
1. They all knew that there were two black hats and two white hats.
2. Man 4 could see man 2 and man 3.
3. If man 4 had seen man 2 and man 3 wearing the same color hats, he would have known for certain that he was wearing the other color and called out.
4. Since he did not yell out, it was obvious that man 2 and man 3 were wearing different color hats.
5. Since man 3 could see that man 2 wore a white hat, he knew that he was wearing a black hat.
Remember, while many traders use inductive reasoning, a good trader must also be skillful at deductive reasoning.
The information on this website solely reflects the analysis of or opinion about the performance of securities and financial markets by the writers whose articles appear on the site. The views expressed by the writers are not necessarily the views of Minyanville Media, Inc. or members of its management. Nothing contained on the website is intended to constitute a recommendation or advice addressed to an individual investor or category of investors to purchase, sell or hold any security, or to take any action with respect to the prospective movement of the securities markets or to solicit the purchase or sale of any security. Any investment decisions must be made by the reader either individually or in consultation with his or her investment professional. Minyanville writers and staff may trade or hold positions in securities that are discussed in articles appearing on the website. Writers of articles are required to disclose whether they have a position in any stock or fund discussed in an article, but are not permitted to disclose the size or direction of the position. Nothing on this website is intended to solicit business of any kind for a writer's business or fund. Minyanville management and staff as well as contributing writers will not respond to emails or other communications requesting investment advice.
Copyright 2011 Minyanville Media, Inc. All Rights Reserved.
Daily Recap Newsletter