alleryEvery positive integer is composite, prime, or which special number?
AThe number 10
BThe number 0
CThe number 2
DThe unit 1
Answer & Solution
Correct answer: D. The unit 1
1. Positive integers fall into three groups.
2. The groups are composite numbers, primes, and the unit 1.
3. 1 is neither prime nor composite; 2 is prime and 10 is composite.
_Source: Wikipedia, Composite number, lead section_
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