Answers by Jorge Campos
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Answers by Jorge Campos

Answers by Jorge Campos
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How many 4-digit personal identification numbers are possible if the number cannot contain a zero?
answered Jun 13, 2018
4 votes
3.7k views
Oxygen is composed of only one kind of atom and can’t be separated into simpler substances. What type of matter is it?
answered Mar 22, 2018
2 votes
14.4k views
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