In a survey out of 100 patients who reported at a clinic in a week it was found out that 70 complained of fever and has stomach ache, 30 injure. All the 100 patients had at least one of the complaints

In a survey out of 100 patients who reported at a clinic in a week it was found out that 70 complained of fever and has stomach ache, 30 injure. All the 100 patients had at least one of the complaints and 44 had exactly two of the complaints. How many patients had all three complaints

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