# Need help with Physics question

**Question description**

Which of the following is a valid probability distribution for a sample space S = {a,b,c,d}? a. Pr(a) = .6, Pr(b) = 0, Pr(c) = .3, Pr(d) = .1 b. Pr(a)= -.2 Pr(b) = .5, Pr(c) = .4, Pr(d) = .3 c. Pr(a) = .3 Pr(b) = .1, Pr(c) = .2, Pr(d) = .5 d. Pr(a) = .5, Pr(b) = .2, Pr(c) = .1, Pr(d) = .3 e. NONE

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