Question

Prove the above relationship ​

Answer 1

Answer:

The answer is given in the attachment. I have done it from the 2nd step

Answer 2

Answer:

hope it helps u bro

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(n-1)!/(n-1-r)! + r ( n-1) !/(n-1-(r-1))!

(n-1)!/(n-1-r)! +r(n-1)!/(n-1-r+1)!

(n-1)!/(n-1-r)! + r(n-1)!/(n-r)!

(n-1)!/(n-r-1)! + r (n-1)!/(n-r-1)!(n-r)

(n-1)!/(n-r-1)! [1+ r/n-r]

(n-1)!/(n-r-1)!*n-r+r /n-r

(n-1)!/(n-r-1)!* n/ n-r

n! /(n-r)!

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