Giải các bất phương trình sau:
a) $_{n+2}^{n-1}\textrm{C}+_{n+2}^{n}\textrm{C}> \frac{5}{2}._{n}^{2}\textrm{A}$
b) $\frac{(n+5)!}{(n-k)!}\leq 60._{n+3}^{k+2}\textrm{A}$
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