Question

Let's play sudoku. Here are the rules: 1, 2, 3, and 4 must occur only once in each column, row, and the 2 × 2 grid.
Find out what will come in place of '?'.

• A. 1
• B. 2
• C. 3
• D. 4

Answer 1

The correct option is D 4

Here, 1 and 2 are already present in $2\times 2$ grid.
3 is present in 2nd column, that means we cannot write 3 in place of '?'.
Hence, we can write 4 in place of '?'.
You can solve the whole puzzle, and it will look like this: