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One reason the number 89 does not belong is because it is a prime number and the other numbers are not.
Hawaii has a set of three islands
Hawaii has a set of three islands
-- 11 doesn't belong, because it's the only one that's less than 19 . -- 19 doesn't belong, because it's the only one without a ' 1 ' in the units place. -- 81 doesn't belong because it's the only one that's greater than 80. -- 21 doesn't belong because it's the only one with four distinct factors. -- 41 doesn't belong because it's the only prime that's bigger than all the other primes in the group.
No, they can belong to infinitely many subsets.