Question

find the middle term of ap 19,16,13......-68​

Answer 1

ap is 19,16,13.....-68

an= -68

a= 19

d= 16-19

d= -3

a+(n-1)d= -68

19+(n-1)(-3)= -68

n-1(-3)= -68-19

n-1(-3)= -87

n-1= -87/-3

n-1=29

n=29+1

n=30

middle term= n/2=30/2

=15

a15= 19+(15-1)(-3)

= 19+14(-3)

= 19-42

= -23