Question 64051
a= {i,3,5,7,9} b={2,4,6,8}. and c={1,4,10} 
A u C= 1,3,4,5,7,10 ? is this right?
Yes, it is correct
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B upside down "u" C = {1}
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(A u B) upside down "u" C={1,2,3,4,5,6,7,8,9}intersect{1,4,10}={1,4}
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Cheers,
Stan H.