Depressed ah, can't do the number of primary school to find the law of the problem! There is a certain rule for each group of numbers below. What is the rule? 1.2,4,12,16,30 2.1,3,9,15,27 3.5,10,20,25,45 4.3,9,15,21,33

Depressed ah, can't do the number of primary school to find the law of the problem! There is a certain rule for each group of numbers below. What is the rule? 1.2,4,12,16,30 2.1,3,9,15,27 3.5,10,20,25,45 4.3,9,15,21,33

First of all, the law of primary school will not be too difficult. Don't consider it from the difficult aspect
1. Even number of 2,4,12,16,30
2. Odd numbers 1,3,9,15,27
3. Multiples of 5,10,20,25,45,5
4. Multiples of 3,9,15,21,33 3

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