In A P the third term is 4 the first term The 6th term is 17 find series

Answer 1

I assume you meant to say: the third term is four times the first term
---> a+2d = 4a
2d = 3a
d = 3a/2
also, a+5d = 17
a + 5(3a/2) = 17
2a + 15a = 34
17a = 34
a = 2 , then d = 3
series is 2+5+8+11+ ...