N would be 3. 
means the one on the left is the same as, or less than the one on the right. The one on the right is 21. N would be 3 because 7 x 3 = 21. Therefore 7n is the same as 21. 7 x 3 = 21. N=3.
~Silver
~Silver
Each individual in a biological population is assumed to give
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