Find n and r If .^nPr = .^nP(r+1)and (.^...

Find n and r If `.^nPr = .^nP(r+1)and (.^nCr =.^ nC(r-1))`.

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if ^nP_r= ^nP_(r+1) and ^nC_r= ^nC_(r-1) find n and r.

If .^nP_r = .^nP_(r + 1) and .^nC_r = .^nC_(r-1) then the value of n + r is..

Find n and r if. (a)^nP_r = 720 and ^nC_(n-r) = 120 (b) ^nC_(r-1) : ^nC_r : ^nC_(r+1) = 20 : 35 : 42

If "^nP_r = "^nC_r , then

Find n and r if ""^nP_r=1680,""^nC_r=70.

Find the value of r if "^nP_r = 3024 and "^nC_r = 126

Prove that nC_r = nC_(n-r)

Prove that ^"" nC_r=^nC_(n-r)

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