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OpenStudy (anonymous):
In series and sequences, what is the difference between the formulas n(n+1)/2 and n/2(a+l) where a=first term and l=last term???
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ganeshie8 (ganeshie8):
n(n+1)/2 : is used for calculating sum for a special arithmetic sequence, it gives sum of FIRST n natural numbers the other one is a generic formula for calculating sum for any arithmetic sequence
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