Prime and odd are the only ones I could think of
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To find the total number in 4 groups of 19, you would multiply the number of groups (4) by the number in each group (19). This calculation would be 4 x 19 = 76. Therefore, there are 76 in 4 groups of 19.
22 - it is even, it is composite.
121 is 11 to the second power 361 is 19 to the second power 576 is 24 to the second power 1000 does not belong because no number to the second power = 1000
There are: 361/19 = 19
-- 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.