# 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.
×