RewardandRiskAnalytics   2012

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Last revised: June 03, 2012

Reference desk

The Tokyo Puzzles

The Tokyo Puzzles (New York: Scribner, 1978), by Kobon Fujimura, edited and with an introduction by Martin Gardner, has 98 puzzles of wide variety.

We like the puzzles we've studied, including the one that is, essentially, I.Q. #201. Fujimora's solution is crystal clear, brief, and (many people will find) surprising.

The prices are all over the place. We joined the list of people, who would like to see this book available for the Kindle. Maybe, waiting for the Kindle version is the way to go.

201. A cubic angle 2012-5-29

Imagine the following picture, draw it, or model it with a Rubik's CubeTM. You see three faces of a cube: the top, the front, and the right side. Point A is at the back (far), left corner of the top face. Point B is at the right, front (near) corner of the top face. Point C is at the bottom, left corner of the front (near) face.

Line segments AB and BC form an angle at vertex B. What is the measure of that angle in degrees?


202. Are you smarter than an eighth grader?

Here's the question that the champion answered at a recent middle school math competition:


A bag of coins contains only pennies, nickels and dimes with at least five of each. How many unique, total, monetary values are possible if five coins are selected at random?