Q5 Easy AP

Algebra Level 3

An arithmetical progression all 2 positive terms. The ratio of the difference of the 4th and 8th term to the 15th term is $$\frac { 4 }{ 15 }$$ and the square of the difference of the 4th and the 1st term is 225. Which term of the series is 2015?

This problem is a part of my set NMTC 2015
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