Question

In an A.P, if the common difference $4$, and the seventh term is $4$, then find the first term.

Answer 1

Let first term be $a$

And, common difference be $d=4$,

According to question,

$a+6d=4$

$\Rightarrow$ $a+6\times 4=4$

$\Rightarrow$ $a=4-24$

$\Rightarrow$ $a=-20$