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20 12? A mathematical probability test in Xiangtan
These four lights are different (5 10 10 10), which means that the first one is 5, and the second, third and fourth lights are 10.

(10 5 10 10) means that the first 34 is 10 and the second is 5. Although there are three 10 and one 5, the lamps installed are different and belong to different situations.

What you said is only the possible result considering the number of light bulbs you bought, 4-0 3- 1 2-2 1-3 0-4.