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  • Brainly User
2015-09-11T11:21:58+08:00

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The common element to all sets is 11
the answer is {11}
0
2015-09-11T11:32:15+08:00
A={10,11,12},  
B={1,3,5,7,9,11},  
C={4,5,6,7,8,9,10,11} 
={5,7,9,11}
0
Hmm, when you draw that in a Venn Diagram, the common element to all is 11 :-) So the intersection of all sets is 11.