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Answer:
[tex]2^{2} *5[/tex]
Step-by-step explanation:
20 = 2 x 10
10 = 2 x 5
20 = 2 x 2 x 5
2 x 2 = [tex]2^{2}[/tex],
20 = [tex]2^{2} *5[/tex]
Prime factorization:
All numbers are prime,
2, 5 is prime.