The $$2's$$ complement representation of $${\left( { - 539} \right)_{10}}$$ in hexadecimal is

Given the following Karnaugh map, which one of the following represents the minimal Sum-Of-Products of the map?

Seven (distinct) car accidents occurred in a week. What is the probability that they all occurred on the same day ?

Let $$f:\,A\, \to B$$ be a function, and let E and F be subsets of A. Consider the following statements about images.

$$S1:\,f\,\left( {E\, \cup \,F} \right)\, = \,f\left( E \right)\, \cup \,f\,\left( F \right)$$
$$S2:\,f\,\left( {E\, \cap \,F} \right)\, = \,f\left( E \right)\, \cap \,f\,\left( F \right)$$
Which of the following is true about S1 and S2?