Compute \frac{1}{1 \times 4} + \frac{1}{4 \times 7} + \frac{1}{7 \times 12}
1 / (1 • 4) + 1 / (4 • 7) + 1 / (7 • 12)
Looks like the common
denominator can be 84 21 / 84 + 3 / 84 + 1 / 84
25 / 84 ≈ 0.2976
.
+829 
