Use $ \subseteq, \nsubseteq, \subset $, or both $ \subset $ and $ \subseteq$ to make a true statement.
-$$\{ 11,12,13 \} ....... \{ 10,11,12,13 \}$$
A) $\nsubseteq$
B) $\subseteq$
C) $\subset$
D) $\subset$ and $\subseteq$

Question

Quizplus · Accepted Answer

The set $\{ 11,12,13 \}$ is both a subset ($\subseteq$) and a proper subset ($\subset$) of $\{ 10,11,12,13 \}$ because all elements of the first set are in the second set, and the second set has additional elements.

Use ⊆,⊈,⊂ \subseteq, \nsubseteq, \subset ⊆,⊈,⊂ , or Both ⊂ \subset ⊂

Use $\subseteq, \nsubseteq, \subset$ , or Both $\subset$