Almost all numbers present

Calculus Level 4

\[ \frac {1}{1 \times 2 \times 3} + \frac 1 {5 \times 6 \times 7} + \frac 1 {9 \times 10 \times 11} + \ldots = \ ? \]

Details and Assumptions:

  • You are encouraged to find the exact form of the infinite sum above.
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