#Discrete Math (Answer if IQ > 120)

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late lodge
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Assume the person takes out the integers 3,7,6,12,4 (in any order)

The chance that he got them in order is 1/120 as there were 120 ways he could’ve grabbed those and only one way they would’ve been in order (if he grabbed 3,4,6,7,12)

This is true for any 5 integers 1to20 a,b,c,d,e for the same reason as all five numbers will be different

Figure out how many ways he can grab 5 integers from a group of 20 if order matters (3,4,5,6,7 and 7,6,5,4,3 would count as 2)

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Hint: Factorials