7 is a Prime number. So the only real factoring you can do is 7 x 1
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Factor tree for 49:49/ \7 x 7497,7
133 7 x 19 Both 7 and 19 are prime numbers, so the factor tree is complete.
245 5, 49 5, 7, 7
it is ^ ^ 21 5 ^ 7 3
3-3-5-7