35. How Many True Negatives?

Question:

Suppose our data looks like this:

predictions = [0, 1, 1, 0, 0, 0, 1, 0, 1, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0, 1]

true labels = [0, 0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 1, 0, 1, 1, 1, 0, 1, 0, 0]

(this is fabricated data, just to give you some practice)

How many true negatives are there in this example?