Medical trail

In a medical trail, there were 80 patients. Twenty-four received treatment A, 30 received treatment B, and 20 received both treatment A and treatment B. How many patients did not undergo any treatment?

Correct answer:

x =  6

Step-by-step explanation:

n=80 A=24 B=30 C=20  A+B+C+x=n  x=nABC=80243020=6

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