Question

Find which term of the ap 5,17,29,41,.... Will be 120 more than its 15th term

Answer 1

Answer:

15th term =a+14d=5+14*12=173

n th term =173+120=293

5+(n-1)d=293

(n-1)d=288

(n-1)12=288

n-1=288/12=24

n=25