Category: developerslifestyle
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How to slay the dragon?
My son came home from school with the following riddle, or rather a math puzzle: Let’s slay a monster. Here are the rules: – The monster has 3 heads and 3 tails. – You have a SWORD and you can choose between these actions: 1. Slash off ONE HEAD. Result: one head will grow back.…
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You have 10 red and 10 black marbles…
You have 10 red and 10 black marbles. In how many ways can you put the 20 marbles in a row so that no more than two marbles of the same colour lie next to each other? An example of a valid sequence would be: Can you reason your way out of this one or…