Question

If the first second and last term of arithmetic series are a, b, &c then nth term is

Answer 1

since a, b and C are in A.P ,

here 1st term=a,

common difference=(b-a),


then

9th term=[2×a+(9-1)×(b-a)],


=[2a+8×(b-a)],

=[2a+8b-8a],

=(8b-6a)