A bag contains five white and four red balls

A bag contains five white and four red balls. Two balls are picked at random from the bag. What is the probability that they both are different color?

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 #453