Question

Please solution of set miscellaneous. ..
Thnk u..

Answer 1

$\underline{\bf HELLO \: \: DEAR,}$

X ∈ C - B => x ∈ C but x ∉ B

x ∈ C but x ∉ A

x ∈ C - A

therefore, C - B ⊂ C - A



$\boxed{\underline{\bf I \: \: HOPE \: \: ITS \: \: HELP \: \: YOU \: \: DEAR, \: \: THANKS}}$