Question

Choose the correct answer from the given four options: In an AP, if d = –4, n = 7, an = 4, then a is *

6

20

7

28​

Answer 1

`a = 28.`

Step-by-step explanation:

`{a}n = a + (n - 1)d`

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

`4 = a + 6( - 4)`

`4 = a + ( - 24)`

`4 = a - 24`

`4 + 24 = a`

`28 = a`

(OR)

`a = 28.`