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Math Help - l want to know the arithmetic progression formulae

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    l want to know the arithmetic progression formulae

    my name is kabir and I am studying XI science I want to formulae of arithmetic progression.
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    Re: l want to know the arithmetic progression formulae

    \displaystyle \begin{align*} t_n = a + (n-1)d \end{align*} and \displaystyle \begin{align*} S_n = \frac{n}{2}[2a + (n-1)d] \end{align*} or \displaystyle \begin{align*} S_n = \frac{n}{2}( a + l ) \end{align*} .
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