72
36,2
18,2,2
9,2,2,2
3,3,2,2,2
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3 is a prime number. Prime numbers don't have factor trees. The factors of 3 are 1 and 3.
listing method , factor tree
46 23,2
39 3,13
The purpose of a factor tree is to divide a number into prime factors. 1 is not a prime number.