Question

In a series 21,18,15,..........,which middle term is -81?

Answer 1

Answer:

hope it will help you. ..........

Answer 2

In this series, 3 is subtracted from each term.. And (-81) is the 108th term... You can check by subtraction..

I did this by :

21 is the 21st term till 0..After that (-81 )is 81st term..

Hope this helps....