phy1004 thermal physics
phy1004 thermal physics
phy1004 thermal physics
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<strong>phy1004</strong>W<br />
Thermal Physics<br />
Making fewer distinctions<br />
IG-09<br />
Of the five balls, imagine three are red, and two green.<br />
Say we do not care about the ball number, just the colour,<br />
eg RRRGG or RGRGR.<br />
There are 5! = 120 numbered sequences.<br />
There are 3! = 6 permutations of red balls, and<br />
there are 2! = 2 permutations of green balls.<br />
Thus the number of different colour sequences is:<br />
52
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