mellohead955 mellohead955

21-09-2016
Mathematics

contestada

s=n(a1+an)/2 gives the partial sum of an arithmetic sequence. What is the formula solved for an?

Respuesta :

nobillionaireNobley nobillionaireNobley

23-09-2016

S = n(a1 + an)/2
2S = n(a1 + an)
2S = na1 + nan
nan = 2S - na1
an = (2S - n a1)/n

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bellelerae bellelerae

18-08-2018

Just took the quiz.

The answer is an=2S-a1n/n

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