SUDOKU
Here are three puzzles: a Samurai Sudoku, and two regular Sudokus. The Samurai Sudoku puzzle is made up of five smaller Sudoku puzzles: one in the center and the other four overlapping the corner
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#20 – Month and Day What is the probability that the months (January, February,…December) and days (Monday, Tuesday,… Friday) of birth of two randomly chosen individuals are identical? The Prize for This Question: Rubik’s
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Here are three puzzles: a Samurai Sudoku, and two regular Sudokus. The Samurai Sudoku puzzle is made up of five smaller Sudoku puzzles: one in the center and the other four overlapping the corner
Read More »IEEE Weekly Puzzle
#19 – Cube The net of a cube is displayed in the figure. What can the maximal value of the summation of the sides that meet at any vertex be? The Prize for This
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Here are three puzzles: a Samurai Sudoku, and two regular Sudokus. The Samurai Sudoku puzzle is made up of five smaller Sudoku puzzles: one in the center and the other four overlapping the corner
Read More »IEEE Weekly Puzzle
#18 – Four-Digit Number We have a four-digit number, each of whose **************** digits is a different number. The number itself (ABCD) and its reversed version (DCBA) are divisible by the sum of its
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Here are three puzzles: a Samurai Sudoku, and two regular Sudokus. The Samurai Sudoku puzzle is made up of five smaller Sudoku puzzles: one in the center and the other four overlapping the corner
Read More »IEEE Weekly Puzzle
17 – Division We have a four-digit number. When we divide it by 5, 7 and 9, the remainders are 3, 5 and 7, respectively. What is the largest number that satisfies these conditions?
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