Question

What is the simple space for choosing a number that is divisible by two from all the whole numbers greater than zero but less than 25

Answer 1

The sample space is actually the set

$\Omega = \{ 1,2,3,...,24,25\}$

Assuming the question is probability-based, the sigma-albegra associated is simply based on all the possible subsets of $\Omega$. Finally, the probability of a certain event

$P(E\subset\Omega) = \frac{n(E)}{n(\Omega)}=\frac{n(E)}{25}$