Locked Boxes

Suppose there are 100 boxes. The keys for these boxes are distributed uniformly at random among the boxes such that each box contains exactly one key. Five boxes (chosen uniformly at random) are left open and the other 95 are locked. What is the probability that you will be able to open all the boxes?

1 / 5 1/5 1 / 20 1/20 1 / 100 1/100 5 ! / 100 ! 5!/100!

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