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B
{(a,d),(b,d),(c,d)}
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C
{(d,a),(d,b),(d,c)}
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D
none of these
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Solution
The correct option is D none of these A×(B∪C)={a,b,c}×{a,c,d,e,f} The above set will consist of 15 ordered pairs and not 3. Hence option 'D' is correct choice.