space of an experiment: find value of P({A, C})

[Navyguy]

The sample space of an experiment is {A, B, C, D}. Given that P(A) = 0.1, P(B) = 0.3, and P(C) = 0.4, what is the value of P({A, C})?

My answer is 0.1x0.4 = 0.4. Is this right or did I set up the problem wrong? Thanks for any help given.

 

[stapel]

Does P({A, C}) mean the probability of both ("and") or the probability of at least one ("or")? How did you set this up? What was your reasoning?

Thank you.

Eliz.