Urn 1contains 7 red balls and 3black balls.Urn 2contains 6 red balls and 3black balls.A ball is picked at random from Urn 1 and placed in Urn 2. Then a ball is picked at random from Urn 2.

What is the probability that the second ball picked is black?

Whenever I'm on campus, I visit a coffee shop:Kilau with probability 0.4; the Library Caf with probability 0.3; and Shelter with probability 0.3.If I visitKilau, I'll buy a cake with probability 0.8. If I go to the Library caf, I'll buy a cake with probability0.6. If I go to Shelter, I'll buy a cake with probability 0.7.

What is the probability I'll buy a cake next time I'm on campus?

please solve...