Question

$a,e$ is a subset of $\{x:x\text{is a vowel in the English alphabet}\}$.( Enter 1 if true or 0 otherwise)

Answer 1

$x$ is a vowel in the English alphabet. Vowels are $a,e,i,o$ and $u$.

So, $a,e$ is a subset of $\{x:x$ is a vowel in the English alphabet$\}$