nads - You have a fox, a chicken and a sack of grain. You...

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You have a fox, a chicken and a sack of grain. You must cross a river with only one of them at a time. If you leave the fox with the chicken he will eat it; if you leave the chicken with the grain he will eat it. How can you get all three across safely? Take the chicken over first. Go back and bring the grain next, but instead of leaving the chicken with the grain, come back with the chicken. Leave the chicken on the first side and take the fox with you. Leave it on the other side with the grain. Finally, go back over and get the chicken and bring it over. You have 12 black socks and 12 white socks mixed up in a drawer. You're up very early and it's too dark to tell them apart. What's the smallest number of socks you need to take out (blindly) to be sure of having a matching pair? 3 socks. If the first sock is black, the second one could be black, in which case you have a matching pair. If the second sock is white, the third sock will be either black and match the first sock, or white and match the second sock. What is special about the following sequence of numbers? 8 5 4 9 1 7 6 10 3 2 0 The numbers are in alphabetical order.
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This note was uploaded on 08/24/2011 for the course M.E 109 taught by Professor Mrqube during the Spring '11 term at Ateneo de Manila University.

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nads - You have a fox, a chicken and a sack of grain. You...

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