Vitamin A,C, D and the hormone thyroxine. Fadhil Alsultani .
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The set of factors includes one and the number itself. Proper factors do not include those two.
Proper factors occur when you list all the factors of a number except for 1 and the number itself. Common factors occur when you compare a minimum of two sets of factors and see which ones they share.
Proper factors do not include one and the number itself. The only one left is 2.
No, no prime number has proper factors.
24 has eight factors, which means it has six proper factors.