2. 外语
  3. From a box of 10 lightbulbs, you are to remove 4. How many different sets of 4 lightbulbs could you remove?

From a box of 10 lightbulbs, you are to remove 4. How many different sets of 4 lightbulbs could you remove?

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问题 From a box of 10 lightbulbs, you are to remove 4. How many different sets of 4 lightbulbs could you remove?
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