how do you caluculate 15!/11!4! ?

What does ! mean and how do I calculate this problem?
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1 Answer

15! / (11! * 4!)=(1*2*3*4...*15)/(1*2*3*...11) / (1*2*3*4)

=(12*13*14*15)/(1*2*3<4)

=(1*13*14*15)/(1*2)

=13*7*15

=1365
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