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Todd wants to know how many numbers between 1 and 50 have only 2 and 5 as prime factors. list all the numbers that have only 2 and 5 as prime factors.Explain how you found your answer.

Answer :

10,20,30,40

you know this because if you do prime factorization both 2 and 5 are prime numbers found in those numbers.
10,20,30,40,50

2 and 5 are both factorization numbers

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