(1 / 2-1 / 3) (1 / 4-1 / 5) (1 / 7-1 / 10) (1 / 14-1 / 15) (1 / 28 1 / 30)

(1 / 2-1 / 3) (1 / 4-1 / 5) (1 / 7-1 / 10) (1 / 14-1 / 15) (1 / 28 1 / 30)


Original formula = 1 / 2 × 1 / 3 × 1 / 4 × 3 × 1 / 7 × 1 / 10 × 1 / 14 × 1 / 15 × 2 × 1 / 28 × 1 / 30 = 1 / 49392000