# The denominator isn't consecutive

Algebra Level 5

$\large \dfrac{3}{1\times 2 \times 4} + \dfrac{4}{2 \times 3 \times 5} + \dfrac{5}{3 \times 4 \times 6} + \ldots$

If the above summation can be expressed as $$\dfrac{a}{b}$$ where $$a,b$$ are co-prime natural numbers, find $$a+b$$.

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