There is a 5×5 grid in front of you. You have to fill 25 squares with only 0 and 1. But, every neighboring square's number's product has to be 0. How many possible grids there are?
There are 2 possible patterns to fill the grid, every 1 must have 0 in neighboring square, see picture
Draw a square then draw a square on each of its sides. Which 5 different numbers from 0 to 9 can be put in the squares so that the 4 outside numbers add up to the middle number?
You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)
