"P(B\\cup C\\cup F)=1-P(B^c\\cap C^c\\cap F^c)=1-0.06=0.94"
"P(B\\cup C\\cup F)=P(B)+P( C)+P(F)-P(B\\cap C)-P(B\\cap F)-P(F\\cap C)+P(B\\cap C\\cap F)"
"0.94=0.6+0.52+0.45-0.3-0.28-0.25+P(B\\cap C\\cap F)"
The number of students enrolled in 3 subjects:
The number of students who enrolled in only one subject:
"1000((0.6-0.3-0.28+0.2)+(0.52-0.3-0.25+0.2)+(0.45-0.25-0.28+0.2))=510"
The number of students who enrolled in at least 2 of 3 subjects:
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