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Math Help - How to deal with the summation?

  1. #1
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    How to deal with the summation?

    How to deal with the summation?-expand.jpg
    See Attachment. I do not know how to expand the equation stated in the attachment. The "!" is very confusing me. I tried to expand the equation on my own and input values into it, but I can't get the correct value so I guess that I may do something wrong.
    Can someone help me to expand that equation for me once? Thank you.
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  2. #2
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    \displaystyle ! is the factorial symbol. Basically, if \displaystyle n is a positive integer, then \displaystyle n! = n \cdot (n-1) \cdot (n-2) \dots 3 \cdot 2 \cdot 1
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