Question

In an Ap,if the common difference (d) = -4, and the seventh term
$( a_{7})$
is 4 ,then find the first term.

Answer 1

As nth term = a + d( n - 1 )


So,

7th term = a + d( 7 - 1 )
7th term = a + d( 6 )
4 = a + ( -4×6 )
4 = a - 24
4 + 24 = a
28 = a = first term

Answer 2

Hope this helps you ☺☺