If \[^{n}{{C}_{r}}={{\,}^{n}}{{C}_{r-1}}\] and \[^{n}{{P}_{r}}{{=}^{n}}{{P}_{r+1}}\], then the value of n is

If \[^{n}{{C}_{r}}={{\,}^{n}}{{C}_{r-1}}\] and \[^{n}{{P}_{r}}{{=}^{n}

1.	If \[^{n}{{C}_{r}}={{\,}^{n}}{{C}_{r-1}}\] and \[^{n}{{P}_{r}}{{=}^{n}}{{P}_{r+1}}\], then the value of n is
A.	3
B.	4
C.	2
D.	5
Answer» B. 4

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If \[^{n}{{C}_{r}}={{\,}^{n}}{{C}_{r-1}}\] and \[^{n}{{P}_{r}}{{=}^{n}}{{P}_{r+1}}\], then the value of n is

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