alleryAll known perfect numbers have which parity?
AAll are even
BAll are odd
CHalf are odd
DAll are prime
Answer & Solution
Correct answer: A. All are even
1. Perfect numbers such as 6 and 28 are all even.
2. No odd perfect number has ever been found.
3. Whether one exists is unknown, so the statement is only about known ones.
_Source: Wikipedia, Parity (mathematics), Number theory_
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