Question

find the number of terms in the following APs 18 , 15½ ,
13, ............, - 47 ​

Answer 1

Answer:

18,15$\frac{1}{2}$,13........-47

d=31/2-18

=-5/2

a=18

l=-47

l=a+(n-1)d

-47=18+(n-1)-5/2

-65=-5/2(n-1)

26=n-1

n=27

so no.of terms is 27