There are two petals and four petals on the 3 and 5 faces, respectively. There are no petals on the 1 face, so it also counts as zero. There is no rose on the 2, 4, or 6 faces, so these count as zero. The rose's "petals" are the dots which surround the center dot.
On a standard 6-sided die, this corresponds to the three odd faces-1, 3, and 5. The calculated (announced) result for a throw is calculated by counting only the "petals around the rose", where a "rose" is any die face with a center dot. The key to the formula is given by the name of the puzzle, and the presenter should state the name of the challenge distinctly. It is intended that they keep the formula to themselves. Players are challenged to work out the formula being used by the presenter and to verbally announce the calculated result of each roll along with the presenter. The puzzle is commonly presented as a challenge in which one person (the presenter), familiar with the puzzle's set formula, rolls the dice and announces the calculated result for their roll, repeating ad nauseam. The puzzle became popular in computer circles in the mid 1970s, particularly through an anecdote recounted in Personal Computing which depicts Bill Gates working out the solution in an airport. It is often used as an exercise in inductive reasoning. Petals Around the Rose is a mathematically challenging puzzle in which the object is to work out the formula by which a number is derived from the roll of a set of five or six dice.
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