Question

4. 20th term from the last term 1 point
of the A.P. 21.18.15. .... -72 is: *
O 36
O -15
O -36
O 15






plzzz answer fast​

Answer 1

Answer:

n=20

L=-72

d=-3

20 term from end is l-(n-1)d

=-72+57

= -15