Question

find the 8 th term from last of the ap 17,14,11___-40​

Answer 1

Answer:

l = -40

a = 17

d = 14-17 =-3

n = 8

an =a+(n-1)d

al =l-(n-1)d

=-40-(7)-3

=-40+21

=-19

8th term from last =-19

Answer 2

Answer:

The given A. P. 17,14,11___-40

Here last term = l = -40

Common difference = d = 14 - 17 = -3

we have to find 8th term from the last.

So n = 8

Formula for finding the nth term from the last

= l - (n - 1)d

= -40 - (8 - 1)( -3)

= -40 -7 X ( -3)

= -40 + 21

= -19

So, the 8 th term from last of the given A. P. is -19.