Seudónimo Seudónimo
  • 13-01-2016
  • Mathematics
contestada

Which number is not composite 2,9,15,21

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Аноним Аноним
  • 13-01-2016
A composite number is divisible by other numbers, including 1 and itself. 

Opposite of composite is prime, so we need to look for the PRIME number.

2 is a prime number because it is only divisible by 1 and itself(2). 

Answer: 2
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texily55 texily55
  • 13-01-2016
2 is the only number that is prime. The others are composite because they have factors other than 1 and itself.
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