Question

Which term of ap 3'7'17... Will be 84 more thn its 13th term?

Answer 1

this form is not in the form of an A.P

Answer 2

13th term is 3+60=63
63+84
$63 + 84 = 147 \\ 3 + 5 \times n = 147 \\ n = 145 \div 5 = 29$