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in a group of student,20 study economics,18 study history,21 study science, 7 study only economics and 3 study science and history only. represent it in venn diagram and find how many student study all subjects​

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Unfortunately there isn't enough info. Refer to the image below. Figures 1 and 2 represent different configurations. These are two examples where we haven't locked in all the values. Only the black values 7 and 3 are fixed and we know for sure. Many other scenarios are possible as well.

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