In an Arithmetic Progression, if $a=28, d=-4, n=7$, then find $a_n$.

We know, the formula to find the last term of A.P., which is,

$\Rightarrow a_n=a+\left(n-1\right)d$

Given: $a=28, d=-4, n=7$,

Therefore, putting the values in the above equation we get,

$\Rightarrow a_n=28+\left(7-1\right)\times \left(-4\right)$

$\Rightarrow a_n=28+6\times \left(-4\right)$

$\Rightarrow a_n=28-24$

$\Rightarrow a_n=4$