The sum of x and x+1 is?
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Answer:
2x+1
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Answer:
What is the sum of x (x - 1) from x = 1 to n?
Using the notation x(2) to represent x(x−1), x(3)=x(x−1)(x−2), we have:
S=∑nx=1x(2)=[x(3)3]n+1x=1
=(n+1)n(n−1)3−2×1×03
=(n+1)n(n−1)3
=n!3(n−3)!
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