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n(S): 40 orang
n(A): 23 orang
n(B): 11 orang
n(AnB): 8 orang
40= (23-8)+ (11-8)+ 8+ n
40= 15+3+8+n
40= 26+n
n= 40-26
n= 14
Jadi orang tdk sakit adalah 14 org