Question

which term of an A.P. 3,10,17,......will be 84 more than its 13 term

Answer 1

13th term of A. P=3+12*7=87
according to question 87+84=171
3+(n-1)d=171
(n-1)d=168
(n-1)=168/7=24
n=25
hence 25th term is84 more than its 13th term