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For series interpretation, both tests must be positive for it to be considered a positive result. From the scenario tree this is the result for the first limb on the left, which has probability P(+/+) = Se₁ ï‚´ Se₂ = 0.5 ï‚´ 0.6 = 0.3. Thus, the formula for sensitivity for series interpretation is Se_series = Se₁ ï‚´ Se₂ and for this example is 0.3 or 30%.