The correct expression for the product ((Mn) (Mw))[ Mn and Mw are the number-average and weight-average molar masses, respectively, of a polymer] is
1
N-1\(\sum \)iNiMi
2
N-1\(\sum \)iNiMi2
3
N / \(\sum \)iNiMi
4
N / \(\sum \)iNiMi 2
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