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p/a + q/b = 1/2 / 1 + 1/2 / 2 = 1/2 + 1/4 = 3/4
1/(pa+qb) = 1/(1/2 * 1 + 1/2 * 2) = 1/(1/2 + 1) = 1/(3/2) = 2/3
1/pa + qb = 1/(1/2 * 1) + 1/2 * 2 = 1/(1/2) + 1 = 2 + 1 = 3