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If B sub C, prove that A\\B =A\\C.Is thi...

If B sub C, prove that `A\\B =A\\C.Is this result true when difference is replaced by symmetric difference ? Give reason.

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If `B sub C`, then `x in B impliesx in C`
Now `x in A -C `` `:. A -C =A -B`
But `A Delta B != A Delta C`
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