Question

find the middle term of AP with 17 terms whose 5th term is 23 and commen difference is -2

Answer 1

IN this AP

we are given 5 term = 23

5 term= a+4d, value of D= -2

a -8 = 23

a=23+8

a= 31

Given that, there are 17 terms in this AP, SO the middle most terms is 9

a+8d= 9th term

31+(8)-2=31-16=15

so the middle value is 15