SOLUTION: pls help me to solve this problem:show that r!(nr)=n^pr 2, z p(n,2)+50=p(2n,2)

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Question 1044045: pls help me to solve this problem:show that r!(nr)=n^pr
2, z p(n,2)+50=p(2n,2)
Answer by Edwin McCravy(20055) About Me  (Show Source):
You can put this solution on YOUR website!
Can't understand the notation.  

What is n^pr? Is it n%5E%28pr%29 or n%5Ep%2Ar or nPr?

And what about the z?