And, not surprisingly, it's 1.
That is, the truth table always has a probability that adds up to 1
because it considers all possible cases,
and all possible cases together have a probability of 1.
So we just check this and make sure it's correct.
Reading from this table, we find that the probability of (H,H) is 0.36.
And you can do the same over here.
0.6 * 0.6 = 0.36
So that's our correct answer.