Suppose p = P ( A ) , q = P ( B ) , r = P ( AU B ) , what are the probability P ( A - B ) ?
"P(A \\cup B)=P(A) + P(B) - P(A \\cap B)"
"P(A \\cap B)=P(A)+P(B)-P(A\\cup B)=p+q-r"
"P(A-B)= P(A)-P(A\\cap B)=p-p-q+r=r-q"
Answer: P(A-B)=r-q
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