In an A.P. the third term is 4 times the 1st term

Answer 1

No unique answer here

a+2d = 4a
2d = 3a
d = 3a/2
start with any value of a, pick an even to avoid fractions, then form your AP

e.g.
let a = 6, then d = 9
AP is 6, 15, 24, 33, ...

let a = -4, d = -6
AP is -4, -10, -16, -22, ...
In each case the 3rd term is 4 times the first.