The 3rd term of an ap is 9 while the 11th term is -7,find the first five term of ap

1 answer

T11-T3 = 8d = (-7)-9 = -16
so, d = -2

Now you can find a, and then write the 1st 5 terms.

Or, knowing d=-2, and T3=9, you can work from both sides of T3:

13 11 9 7 5