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as Figure — 11: HMM — Toy Example — Scoring Known Sequence The joint probability for our unknown sequence is therefore P(A,B,A,Red,Green,Red) = [P(y_0=A) P(x_0=Red/y_0=A)] [P(y_1=B|y_0=A|) P(x_1=Green/y_1=B)] [P(y_2=A|y_1=B) P(x_2=Red/y_2=A)] =(1∗1)∗(1∗0.75)∗(1∗1)(1)(1)=(1∗1)∗(1∗0.75)∗(1∗1)