in a class 18 students offered physics,23 offered chemistry,24 iffered maths,of these 11 are both physics and maths,12 in physics and chemistry,13 are both chemistry and maths,6 in all the three subjects,find ; how many are there in the class?how many offered maths not chemistry?how many are taking exactly one of the 3 subjects?Only maths? only physics?only chemistry?none of the subjects?
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it's really difficult. I'm sorry
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