Question

formula of Sn , an ?

Answer 1

Hey friend..!! here's your answer
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Formulas of Sn and An

$an = a + (n - 1)d \\ \\ sn = \frac{n}{2} (2a + (n - 1)d \\ \\ sn = \frac{n}{2} (a + l)d$

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#Hope its help you

Answer 2

an = an = a1 + (n – 1)d.
sn = 2 n(a + ℓ) .