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Mathematics
Mathematics
Problem
5. Show that if
A
⊂
B
\mathrm{A} \subset \mathrm{B}
A
⊂
B
, then
C
−
B
⊂
C
−
A
\mathrm{C}-\mathrm{B} \subset \mathrm{C}-\mathrm{A}
C
−
B
⊂
C
−
A
.
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