I have been working through some factoring problems that include factor trees.
Problem - using a factor tree, express 54 as a product of prime factors.
My answer:
54
2*27
2*3*9
2*3*3*3
Textbook answer:
54
6*9
2*3*3*3
Although they are both correct, I am curious why the textbook excluded using the prime factor of 2 throughout the tree. Is there a rule or convention I am not aware of that made my answer different from the textbook?