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Gemar IPA = 21 org
Gemar IPS = 16 org
Gemar keduanya = 9 org, tidak gemar keduanya(X)?
Gemar IPA = 21 - 9 = 12 org
Gemar IPS = 16 - 9 = 7 org
X = 35 - (12+7+9) = 35 - 28 = 7
Jadi, yg tidak gemar keduanya adalah 7 org