find out the number that doen not belong to the group
for lack of common property: 3 5 7 12 17 19
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Answer: 12
Step-by-step explanation: It is not a prime number but a composite number
Composite number: A number that can be divided by more than two numbers eg. 9÷9 9÷3 and 9÷1
Prime number: A number that can only be divided by 1 and itself
eg. 13 can only be divided like this 13÷1 and 13÷13
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