139 is already prime; no factorization required.
There is no general answer because either method works. And some people are more comfortable following one way while others prefer the other way.
Either or both.
You can use either, so technically you don't "need" one or the other. HOWEVER, for large numbers, Euclid's division algorithm is much faster... INCREDIBLY faster. It gets you the result almost immediately, whereas looking for prime factors of large numbers can take you a long, long time.
What is arithmatic
analytical method.
You either can divide the number, or use the factor tree which is prime factorization or just factorization. However I don't know the answer of that, so you might have to figure that out. :D
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analytical method.
analytical method.
i don't know either
The reason for repeating an experiment is to either verify or disprove the original finding.
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