D)
A B, x A xB,
BC, x B x C.
So for a particular X,x A x B AND x B X C
By the transitivity of implication
this means that x A x C
So A is subset of C.
E)A={} or and B={ ,{1}}
A B,we can easily see that {} is an empty set which is a subset of B.
A B,since we can easily see that is an element of B.
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