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WhosBilly1 WhosBilly1
  • 30-07-2014
  • Mathematics
Answered

In how many ways can a teacher arrange 6 students in the front row of a

classroom with a total of 20 students?

Verified Answer :

Anonymous Anonymous
  • 30-07-2014

\(_n C_r = \frac{n!}{r!(n-r)!}\)
\(_n C _r\) -- the number of combinations of r objects in total n objects.

So for r=6, n=20 we have 
\(_n C_r = \frac{20!}{6!(20-6)!} = 38760\)

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