If a and b are positive integers and x = 16^a and…

If a and b are positive integers and x = 16^a and y = 9^b, which of the following is a possible units digit of xy?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #2622