When marking coursework, a teacher has to complete a form which includes the following:
□
In your opinion is this the original work of the pupil? (tick as appropriate)
I have no reason to believe that it is not □
I cannot confirm that it is □
The teacher suspects that a pupil has copied work from the internet. For each box, state whether the teacher should tick the box or not.
The teacher has no suspicions about the work of another pupil, and has no information about how the work was produced. Which boxes should she tick?
Explain why the teacher must always tick at least one box.
Angus, the ski instructor, says that the class will have to have lunch in Italy tomorrow if it is foggy or if the top ski lift is not working. On the next morning Chloe, one of Angus's students, says that it is not foggy, so they can have lunch in Switzerland.
Produce a line of a truth table which shows that Chloe's deduction is incorrect. You may produce a complete truth table if you wish, but you must indicate a row which shows that Chloe's deduction is incorrect.
You are given that the following two statements are true.
$$\begin{aligned}
& ( \mathrm { X } \vee \sim \mathrm { Y } ) \Rightarrow \mathrm { Z }
& \sim \mathrm { Z }
\end{aligned}$$
Use Boolean algebra to show that Y is true.