Question

Which term of the ap 3,15,27,,39will be 120more than its 21st term

Answer 1

Answer:

11th

Step-by-step explanation:

Total difference = (n-1) d

Here, total difference = 120

Common difference "d" = (15-3) = 13

120 = (n-1) 12

n-1 = 10 n = 11