7. Develop another proof that the Cantor set has measure 0, using the fact that if we denote by jFnj the total length of the intervals in Fn, then by the construction, jFnþ1j ¼ 2 3 jFnj. (Hint: K ¼ 7y j¼0 Fj , but 7n j¼0 Fj ¼ Fn.)