The relation between A and B subset is [tex]A\subseteq B[/tex]
What is Subsets?
A set "X" is said to be the subset of "Y" is each elements of X is present in Y and is denoted by [tex]X\subseteq Y[/tex].
Thus in the given question :
A={summer, autumn, spring, winter}
B={summer, winter}
"summer" and "winter" elements of B is also presents in A therefore, B is subset of A and is denoted as [tex]A\subseteq B[/tex]
check and know more about sets here :
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