Nerdle for September 2022 九月的数字游戏

Once we enter the website https://nerdlegame.com we get the above image of six rows of eight blank cells. We need to place the numbers (1 to 9) and the equal sign ( = ) and the four operational signs ( + - * / ) into the eight cells to guess the equation that forms the solution (which is an equation).

We are then required to guess the envisaged equation (the solution) in six attempts by filling each of the cells with the digits and the five signs (four operational - addition, subtraction, multiplication, and division). What we normally do to start the game is to select a correct equation that comprises of two operational signs (multiply and plus) and five different digits, plus the equal sign. We know logically that the equal sign ( = ) must be located at the right hand side of the equation, in either the fifth, sixth, or seventh position.

The equation to start with is the equation we know the answer. The equation should contain five different digits and two operational signs plus an equal sign. We normally use the multiplication Sign * and the plus Sign to start. Here goes, 6 * 2 + 5 = 17.

Digits 2, 1, and 7, are correct, but not in the right positions. The two signs ( * ) and ( = ) are correctly positioned. The plus ( + ) sign is not in the solution. The next equation that we guessed is 3 * 7 - 1 = 2 0 Here, the minus ( - ) sign is also wrong but the digits 1, 2, and 7 are still in the wrong positions.

Our next attempt is 7 * 8 / 2 = 28. The division sign ( / ) is not correct. So the only sign that is correct is ( * ). We discovered another digit 8 in the solution although the digits 7, 8, and 2 are not in the correct positions. We have however sufficient numbers for us to make an intelligent guess, which is:

9 * 1 * 8 = 72. This turns out to be the solution.