my name is kabir and I am studying XI science I want to formulae of arithmetic progression.

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- Sep 1st 2012, 10:22 PMkshai215l want to know the arithmetic progression formulae
my name is kabir and I am studying XI science I want to formulae of arithmetic progression.

- Sep 1st 2012, 10:26 PMProve ItRe: l want to know the arithmetic progression formulae
$\displaystyle \displaystyle \begin{align*} t_n = a + (n-1)d \end{align*} $ and $\displaystyle \displaystyle \begin{align*} S_n = \frac{n}{2}[2a + (n-1)d] \end{align*} $ or $\displaystyle \displaystyle \begin{align*} S_n = \frac{n}{2}( a + l ) \end{align*} $.