Answer:
PA: 20, 18, 16, 14, 12, 10
PB: 20, 19, 18, 17, 16, 15
(Pair 3)
Step-by-step explanation:
We need to look for a pair with both sides decreasing.
Pair 1 has the exact opposite of what we need happening. It has the sides increasing, so it is out.
Pair 2 has the Pattern A right, but Pattern B is still going up, so it is also out.
Pair 4 has both sides decreasing but the second term on Pattern A is 3 less than the first term when it should be 2. As a result it is also out.
This leaves Pair 3 as our final answer.
