It's not because of a natural law or something; it's inherent in the structure of space, and the shapes of triangles, hexagons, and squares. Your question is like asking, "why does 2 + 2 = 4?" There's not a reason, they just do because that's how things are.
Also, they aren't the only shapes that tile, just the only regular polygons that tile.
>>M.T.<<
Think it has to do with the fact that for a shape to tile the measure of the interior angle multiplied times something has to give you 360, if not the shape cannot tile
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What is the probability that the second tile you pick is yellow? (didnt have enough space to finish the question)
By definition, the 1st 6-tile is the point below which 1/6 of the population falls (irrespective of which distribution is involved). The 2nd 6-tile is the point below which 2/6 of the population falls. This is 100 * 1/3 ~ 33.3% of the population.
Probablity of picking up 3 vowels from the word MATHEMATICS Each of the letters in the word MATHEMATICS is on a letter tile in a bag
The related link explains the difference between a combination (order not important) and a permutation (order is important).In a combination, the order doesn't matter. This is like drawing 5 cards for a poker hand. You can arrange them how you want once you have them. Or a lottery ball problem. You can match the balls, regardless of what order they were drawn. Or rolling 5 dice, like in Yatzee.There's another constraint called repetition. In the dice throwing, you could get all five dice to land on the number 1 (repetition allow). In the card game and lottery ball, once a card or ball is drawn, you cannot draw that one again (no repetition).In a permutation, order is important. So if you have six Scrabble tiles with your letters A through F, and you want to see how many different five letter words you can make (in this example, for permutations a lot of them would not be real English words, just the certain sequence of letters in a particular order - a permutation).Then there is permutation with repetition allowed. This is like you draw a tile, record the result, then return that tile into the pile and mix them up and draw again. The order that you recorded is important for permutations.Depending on which one that you are interested in, there is a formula to calculate. See the related link for explanation of the various formulas.So permutation with repetition, the answer is 6^5 = 7776.Permutation no repetition: 6! / (6-5)! = 6 * 5 * 4 * 3 * 2 * 1 = 720.Combination no repetition: 6! / ((6-5)! * 5!) = 6Combination with repetition: (5 + 6 -1)! / (5! * (6-1)!) = 252