Question

which term of the AP 3, 10,17 will be 84 more than its 13th term

Answer 1

here
a=3,

d=7,

then according to the question , we have

a+(n-1)d=a+12d + 84,


(n-1)d-12d=84,


7[n-1-12]=84,


n-13=84/7,

n-13=12,


then

n=12+13,

n=25

Answer 2

Please check the answer in the attachment.