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nika2105 [10]
3 years ago
12

Can someone break this down for me!! I'm stuck

Mathematics
1 answer:
nadya68 [22]3 years ago
4 0

Answer:

_{12}C_9=220

Step-by-step explanation:

Recall the definition for the combination symbol with the use of factorial (symbol !):

_nC_k=\frac{n!}{k!(n-k)!}

Therefore, for the case where n = 12 and k = 9, we have:

_{12}C_9=\frac{12!}{9!(3)!}\\_{12}C_9=\frac{12*11*10*9*8*7*6*5*4*3*2}{9*8*7*6*5*4*3*2(3*2)}\\\\_{12}C_9=\frac{12*11*10}{3*2}\\\\_{12}C_9=\frac{1320}{6}\\\\_{12}C_9=220

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