Answer:
5!
Explanation:
Since John has five initial choices, must make five decisions, and cannot repeat, we use the factorial 5! to assess how many permutations exist.
120 ways
On the first day, John was 5 choices 5
On the second day he has 4 choices 4
On the third day he has 3 choices
On the fourth day he has 2 choices
On the fifth day he has 1 choice
5*4*3*2*1 = 120 different ways
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