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Discussion

GATE preparation for Electrical Engineering
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There are 16 teachers who can teach thermo(TD),11 who can teach engg science (ES),and 5 who can teach both TD and engg mechanics(EM).there are a total of 40 teachers,6 can not teach any of the three subject,EM,ES AND TD. 6 can only teach ES . 4 can teach all three.4 can teach ES AND TD.HOW many can teach both ES AND EM BUT NOT TD??

 
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