What is the correct formula for calculating the therapeutic index?

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Lethal Dose 100 divided by Effective Dose 100Effective Dose 100 divided by Lethal Dose 100Lethal Dose 50 divided by Effective Dose 50Effective Dose 50 divided by Lethal Dose 50

Explanation

The therapeutic index is defined as the ratio of the lethal dose for 50% of the population (LD50) to the effective dose for 50% of the population (ED50), represented as LD50/ED50.