For any three sets. \( P, Q \) and \( R, s \) is an element of \( (F \) \( \Delta Q) \Delta R \)....

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For any three sets. \( P, Q \) and \( R, s \) is an element of \( (F \) \( \Delta Q) \Delta R \), then s may belong to
(A) Exactly one of \( P, Q \) and \( R \), if \( P, Q \) and \( R \) disjoint sets
(B) At least one of \( P, Q \) and \( R \), but not in all three of them at the same time
(C) Exactly two of \( P, Q \) and \( R \)
(D) Exactly one of \( P, Q \) and \( R \) or in all the three of them


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