Correct Answer: Option A

Explanation

A1 = Elements in the universal set but not in A = {s, w, x, y, z}

  B = {r, s. t, u}

  C = {t, u, v, w, x}

  A1 n B n C = elements common to the three sets = none = empty set = Φ

There is an explanation video available below.

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