Question

Let $A=\{1,2\}$ and $B=\{2,3,4\}$, then $B\times A=\left\{\right(2,1),(2,2),(3,1),(3,2),(4,1),(4,2\left)\right\}$. If true enter $1$, or else enter $0$.

Answer 1

Cartesian product of two sets is found by taking or pairing each element of first set with each element of second set.
Hence, $B\times A=\left\{\right(2,1),(2,2),(3,1),(3,2),(4,1),(4,2\left)\right\}$