Question

Find the 4th term from the end of the AP -11, -8, -5, .........., 49. I got answer as 40 verify that

Answer 1

Given AP is -11,-8,-5,....49.

Here, a = -11, d = -8 - (-11) = 3, tn = 49.

We know that tn = a + (n - 1) * d

= > 49 = -11 + (n - 1) * 3

= > 49 = -11 + 3n - 3

= > 49 = 3n - 14

= > 49 + 14 = 3n

= > 63 = 3n

= > n = 21.

We know that nth term from the end = l - (n - 1) * d

So,

4th term from the end:

= > 49 - (4 - 1) * 3

= > 49 - 3 * 3

= > 49 - 9

= > 40.

Hope this helps!

Answer 2

Hi,

Please see the attached file!


Thanks