(adsbygoogle = window.adsbygoogle || []).push({}); Need help solving a combination for "n"

I've been unable to solve the following combination for "n":

nC3 =10

I got this equation : n³ - 3n² + 2n -30 = 0

But I can't find a common factor of 30 that can be plugged into the equation to equal zero. Am I solving this incorrectly perhaps? Should I be doing something different?

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# Homework Help: Need help solving a combination for n

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