Chemistry
posted by Richard .
Consider a system of three molecules A, B, and C. Suppose that three units of energy can be distributed over the three atoms. Each atom can have no energy, one unit of energy, two units of energy, or all three units of energy. Assume that each of the ten possible arrangements of the three units of energy is equally probable. What is the probability that molecule B has exactly one unit of energy?

Chemistry 
bobpursley
Each atom of three, has four states, and each are equal probable.
Possible configurations...
A,B,C
1,1,1
1,2,0
1,0,2
2,1,0
2,0,1
3,0,0
0,3,0
0,0,3
0,1,2
0,2,1
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