If the statement is true for all sets C and D, write ʺtrue.ʺ If it is not true for all sets C and D, write ʺfalse.ʺ Assume that $ C \not = \varnothing $,and $ C \subset U$.
-$\text { If } C \subset D \text {, then } C \subseteq D \text {. }$

Question

Quizplus · Accepted Answer

If $C \subset D$, it means every element of C is also in D, but C is not equal to D, which satisfies the definition of $C \subseteq D$ (C is a subset of or equal to D).

If the Statement Is True for All Sets C and D