SOLUTION: From a box of 10 lightbulbs, 4 are to be removed. How many different sets of lightbulbs could be removed?

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Question 164172: From a box of 10 lightbulbs, 4 are to be removed. How many different sets of lightbulbs could be removed?
Answer by alicealc(293) About Me  (Show Source):
You can put this solution on YOUR website!
C%2810%2C+4%29+=+10%21%2F%28%2810-4%29%21%2A4%21%29
= 10%2A9%2A8%2A7%2A6%21%2F%286%21%2A4%2A3%2A2%2A1%29
= 10%2A9%2A8%2A7%2F%284%2A3%2A2%29
= 10%2A3%2A7
= 210 sets