4.031
Ich interpretiere "einen" und "zwei" als "genau einen" und "genau zwei".
a1) P(X = 0) = 10/16 * 9/15 = ...
a2) P(X = 1) = 6/16 * 10/15 * 2 = ...
a3) P(X = 2) = 6/16 * 5/15 = ...
b1) P(X = 0) = 10/16 * 9/15 * 8/14 = ...
b2) P(X = 1) = 6/16 * 10/15 * 9/14 * 3 = ...
b3) P(X = 2) = 6/16 * 5/15 * 10/14 * 3 = ...
b4) P(X = 3) = 6/16 * 5/15 * 4/14 = ...