pls if a series begin form 3.4.5.6.7.8.............nth, is it proper to represent it in this form $\displaystyle (n+2)! $ thanks
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No, it's not. If you want $\displaystyle 3\cdot 4\cdot 5\cdot 6\cdot ....n$ then you could write $\displaystyle \frac{n!}{2!}$
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