Factorial Series

Calculus Level 4

\[\large\dfrac{1!}{4!}+\dfrac{2!}{5!}+\dfrac{3!}{6!}+\dfrac{4!}{7!}+\cdots\]

If the value of the above series can be expressed to \(\dfrac{a}{b}\) when \(a\) and \(b\) are coprime positive integers. Find the value of \(a+b\).

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