Mathematics

Problem

If R is a relation from a non - empty set A to a non - empty set B , then a)

\mathrm{R} \subseteq \mathrm{A} \times \mathrm{B}

R=A \cap B

\mathrm{R}=\mathrm{A} \cup \mathrm{B}

\mathrm{R}=\mathrm{A} \times \mathrm{B}