2, 3, 7
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42 21,2 7,3,2
Their at the bottom of the tree because the hole point of a factor tree is to find the prime factorization of the number, so it would be at the bottom of the tree.
42 21,2 7,3,2
as you can obviously see the bottom of a factor tree would be the curious numbers of 2,2,3,5
The bottom branch of a factor tree consists entirely of prime numbers.