Row 2 Column 1 - Shall we call it Cell
(2,1), can take only the value 4. Why? Because values
1 and 2 are already taken in Row 2, and values 2 and 3 are already
taken in column 1. Since we have to fill in a value from 1 to
4, it can't be
anything other than 4. Write 4 in Cell (2,1).
Similarly, what value can Cell (2,3) take? Only
3, (since Row 2 has values 4, 1, and 2 already taken up, and column
3 has value 4 taken up. So, write '3' in Cell (2,3).
Now look at cell (1,2). It can only take the
value 3. (Figure out why?). Fill it up.
Likewise, Cell (3,2) can take only the value
2. Fill it up.
Cell (1,3) can only take the value 1. Fill it
up.
Now, Cells (4,1), (4,2) and (4,3) can only take
the values 1, 4 and 2 respectively. Fill them up.
Finally, Cells (1,4), (3,4) and (4,4) can take
only the values: 4, 1 and 3 respectively.
Hey, we've done it, haven't we? Congrats!
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