Answer:
Some unit fractions can be written as a sum of two different unit fractions in more than one way. Here are the ways to write 1 6: 1 6 = 1 7 + 1 42. 1 6 = 1 8 + 1 24. 1 6 = 1 9 + 1 18. 1 6 = 1 10 + 1 15. ( 1 6 = 1 12 + 1 12, but this has a repeat so it doesn't count.)
Explanation: