if\[I{{f}^{n+1}}{{C}_{r+1}}{{:}^{n}}{{C}_{r}}{{:}^{n-1}}{{C}_{r-1}}=11:6:3\], then nr=

if\[I{{f}^{n+1}}{{C}_{r+1}}{{:}^{n}}{{C}_{r}}{{:}^{n-1}}{{C}_{r-1}}=11

1.	if\[I{{f}^{n+1}}{{C}_{r+1}}{{:}^{n}}{{C}_{r}}{{:}^{n-1}}{{C}_{r-1}}=11:6:3\], then nr=
A.	20
B.	30
C.	40
D.	50
Answer» E.

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if\[I{{f}^{n+1}}{{C}_{r+1}}{{:}^{n}}{{C}_{r}}{{:}^{n-1}}{{C}_{r-1}}=11:6:3\], then nr=

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