Question

Find the forth term from end in an A.P. -11,-18,-5,....,49

Answer 1

Answer:

First term= 5

common diff. = -3

Therefore,

-49 = 5 + ( n - 1) * -3

-49 - 5 = ( n - 1 ) * -3

- 54 / - 3 = ( n - 1 )

18 = n - 1

n = 18 + 1

n = 19

19 th term is -49