Ques 38-II-D-13

38. If n and r are non-negative integers and n > r, then p(n + 1, r) equals to 
(A) P(n,r)(n + 1) / (n + 1 - r)
(B) P(n,r)(n+1) / (n - 1 + r)
(C) p(n,r)(n-l) / (n + 1 - r) 
(D) p(n,r)(n + l) / (n + 1 + r)

ANS-(A)