1.

If \[{{P}_{n}}\] denotes the product of the binomial coefficients in the expansion of \[{{(1+x)}^{n}}\], then \[\frac{{{P}_{n+1}}}{{{P}_{n}}}\]  equals

A. \[\frac{n+1}{n!}\]
B. \[\frac{{{n}^{n}}}{n!}\]
C. \[\frac{{{(n+1)}^{n}}}{(n+1)!}\]
D. \[\frac{{{(n+1)}^{n+1}}}{(n+1)!}\]
Answer» E.


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