# SOLUTION: Hi, Can you tell me what the C means in some of your answers - I don't know how to calculate this..... e.g. 20C6*0.25^6*0.75^14 =0.1686 the answer you gave me to my previous questi

Algebra ->  Algebra  -> Probability-and-statistics -> SOLUTION: Hi, Can you tell me what the C means in some of your answers - I don't know how to calculate this..... e.g. 20C6*0.25^6*0.75^14 =0.1686 the answer you gave me to my previous questi      Log On

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 Click here to see ALL problems on Probability-and-statistics Question 615661: Hi, Can you tell me what the C means in some of your answers - I don't know how to calculate this..... e.g. 20C6*0.25^6*0.75^14 =0.1686 the answer you gave me to my previous question. SueAnswer by jim_thompson5910(28536)   (Show Source): You can put this solution on YOUR website!C stands for the combination formula In general $\LARGE \dpi{120} _{n}C_{r} = \frac{n!}{r!(n-r)!}$ So in this case, n = 20 and r = 6. So plug them in to get $\LARGE \dpi{120} _{20}C_{6} = \frac{20!}{6!(20-6)!} = 38760$