The Strange Pattern



What is the pattern about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0

Ah! Click here to read the solution.



The Socks



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?

Ah! Click here to read the solution.