Respuesta :

LammettHash

I take B - C - D to mean (B - C ) - D, i.e. all elements of B - C not in D, or all elements in B not in C and not in D.

The given sets B and C are identical, so

B = {3, 6, 9, 12, 15, 18, 21}

C = {3, 6, 9, 12, 15, 18, 21}

===>   B - C = { }

Then

(B - C ) - D = { } - D = { } (empty set)

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