Question

In an Arithmetic progression, if d= -4, n=7, an=4, then find a.​

Answer 1

a = 28

Explanation:

`a_n = a + (n-1) d`

`4 = a + (7-1) (-4)`

`4 = a + 6 (-4)`

`4 = a - 24`

`4 +24= a`

`a = 28`