If four coins are tossed, the probability of getting two heads and…

If four coins are tossed, the probability of getting two heads and two tails is -.

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 #18820