7 accidents occur in a week. What is the probablitiy that all the accidents occur in the same day??

THis is what aI did. I assumed , that the probablitiy of an accident occuring is equally likey, so the probablitiy of an accident occuring in a day is 1/7 .. the probablity of a second accident in a day is 1/7 also... so P ( 1st accident & 2nd & 3rd ..... 7th ) should be (1/7 )^7 right ?? but answer is ( 1/7 )^ 6