## 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

Read More »## IEEE Weekly Puzzle

#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

Read More »## 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

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

Read More »## 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

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

Read More »## SUDOKU

## 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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