Question
For all sets A, B and C, $\text{A}-(\text{B} - \text{C}) = (\text{A} - \text{B}) - \text{C}$

Answer

Let us solve the given statement by the following Venn diagram.

Clearly from the above diagram, we calculate that
$\text{A}-(\text{B}-\text{C})\neq(\text{A}-\text{B})-\text{C}$
Hence, the given statements is not 'True'.

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