1, 2, 3, 6
1, 2, 3, 4, 6, 12
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1, 2, 4, 8 1, 2, 3, 4, 6, 12
It is: 18
1) listing method: { 1,2,3} rule method: {x| x is a positive whole number less than four} 2) listing method: { 2,4,6,8,....}. rule method: {x| x is a positive even number }
Alphanumerical
Listing ward method , rule method