List of practice Questions

For two different persons π‘₯ and 𝑦, the predicate 𝑀(π‘₯, 𝑦) denotes that x knows y.
Consider the following statement.
There is a person who does not know anyone else, but that person is known by
everyone else.
Which one of the following expressions represents the above statement?

For two different persons \(x\) and \(y\), the predicate \(M(x, y)\) denotes that \(x\) knows \(y\).
Consider the following statement.
There is a person who does not know anyone else, but that person is known by everyone else.
Which one of the following expressions represents the above statement?