Three alleles (alternative versions of a gene) A, B, and O determine the four blood types A (AA or AO), B (BB or BO), O (OO), and AB. The Hardy-Weinberg Law states that the proportion of individuals in a population who carry two different alleles is P=2pq+2pr+2rq where p,q, and r are the proportions of A, B, and O in the population. Use the fact that p+q+r=1 to find the maximum value of P. (DO NOT USE LAGRANGE MULTIPLIERS)

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