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Let A,B and C be finite sets such that ...

Let `A,B ` and `C` be finite sets such that `AnnBnnC=phi` and each one of the sets `ADeltaB, BDeltaC` and `CDeltaA`has 200 elements. The number of elements is `AuuBuuC` is

A

250

B

200

C

150

D

300

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The correct Answer is:
C
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