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  • 25-05-2020
  • Mathematics
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s=n/2 [a+(n-1)d]
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DeanR
DeanR DeanR
  • 25-05-2020

[tex] s = \dfrac n 2 (a + (n-1) d)[/tex]

[tex]\dfrac{2s}{n} = a + (n-1)d[/tex]

[tex]\dfrac{2s}{n} -(n+1)d = a[/tex]

We could expand this further but let's call it done.

Answer: a = 2s/n - (n+1)d

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