Sets, Counting & Probability : Probability Distribution for a Sample Space

Which of the following is a valid probability distribution for a sample space
S = {a,b,c,d}

a. Pr(a)=-0.2, Pr(b)=0.5, Pr(c)=0.4, Pr(d)=0.3
b. Pr(a)=0.3, PR(b)=0.1, Pr(c)-0.2, Pr(d)=0.5
c. Pr(a)=0.6, Pr(b)=0, Pr(c)=0.3, Pr(d)=0.1
d. Pr(a)=0.5, Pr(b)=0.2, Pr(c)=0.1, Pr(d)=0.3

Solution Summary

A Probability Distribution for a Sample Space is found.

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