The famous Leibniz triangle in the world, as shown in the figure, is the number in the eleventh row from the right to the third position? Fig.1/1 1/2 1/2 1/3 1/6 1/3 1/4 1/12 1/12 1/4 1/5 1/20 1/30 1/20 1/5 1/6 1/30 1/60 1/60 1/30 1/6 1/7 1/42 1/105 1/140 1/105 1/42 1/7 . Find the number in the eleventh row from the right to the third position
The last number in line 11 is 1 / 11, the last number in line 10 is 1 / 10, and the last number in line 9 is 1 / 9, so the penultimate number in line 10 is 1 / 9-1 / 10 = 1 / 90, and the penultimate number in line 11 is 1 / 10-1 / 11 = 1 / 110?