Restriktions enzymer

Hej :) Jeg håber der er nogen som kan hjælpe mig med dette spørgsmål:

If you digest a preparation of human DNA with NotI, a restriction endonuclease that recognizes and cleaves the octameric sequence 5’-GCGGCCGC-3’, how many different restriction fragments would you expect to produce? Assume that the four bases (G, C, A and T) are equally prevalent and randomly distributed in the human genome. The human genome contains 3x10^9 base pairs.