## IEEE Weekly Puzzle #29 – The Sum Is 1,000

The sum of 25 different numbers is 1000. If the largest possible sum of the smallest 15 of these numbers is 525, what is the smallest possible sum of the largest 15 of these

Read More »## PUZZLE… PUZZLE… PUZZLE…

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 #28 – Lucky Number

We have a lucky number consisting of four different digits. Both the first three digits and the last three digits of this number are square numbers. What is the lucky number? The Prize for

Read More »## Puzzle

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 #27 – Balls

There are 30 balls in a bag containing red, black and white balls. -Most of the balls in the bag are black. -To guarantee taking out at least 2 balls of each color, you

Read More »## Puzzle

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 #26 – Heads and Tails

We flip a coin 10 times consecutively. What is the probability of the first 5 flips being heads and the last 5 flips being tails? The Prize for This Question: Rubik’s 2×2 Cube Send

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