\[\boxed{\mathbf{88.}}\]
\[P(A) = 0,2;\ \ P(B) = 0,1;\]
\[P(A \cap B) = 0,05.\]
\[\textbf{а)}\ P(A \cup B) =\]
\[= P(A) + P(B) - P(A \cap B) =\]
\[= 0,2 + 0,1 - 0,05 = 0,25.\]
\[\textbf{б)}\ 1 - P(A \cup B) = 1 - 0,25 =\]
\[= 0,75.\]
\[\textbf{в)}\ P(A) - P(A \cap B) =\]
\[= 0,2 - 0,05 = 0,15.\]
\[\textbf{г)}\ 1 - P(A \cap B) = 1 - 0,05 =\]
\[= 0,95.\]