1、 One half, one third, one fourth, one fifth, one sixth What's the number 50? What's the number 2013?

1、 One half, one third, one fourth, one fifth, one sixth What's the number 50? What's the number 2013?

According to the meaning of the title, we can get such a rule
When the remainder is 2, the number is - 1 / N, otherwise it is 1 / n
therefore
50 △ 4 = 12, the remainder is 2, so the fiftieth number is - 1 / 50
2013 △ 4 = 503, the remainder is 1, not 2, so the number of 2013 is 1 / 2013