Hello Khonics89I hope you realise that this is not a complete truth table for three input variables, and . You have only the four lines where ; you need another four lines with to complete the table.

Nevertheless, to answer your question:

- Look for the lines of the table where the output value is 1 (True)

- For each of these lines, construct a logical expression, using AND and NOT as appropriate, to construct the expression that corresponds to the True-False values of the input variables. (See below for examples.)

- Combine each of these expressions using OR's to give a single Boolean expression to represent the output of the complete table.

- If desired (and if you can!), simplify the resulting Boolean expression.

In the (part-)example that you quote, on lines 2, 3 and 4.

On line 2, and are True; is False. So this line is AND AND (NOT ); or

On line 3, is True; is False; is True. So this line is

Similarly line 4 is

Combining these three expressions using OR's then, we get:

(This could then be simplified to , if your Boolean algebra is up to it.)

Grandad