You Have Been Asked to Select at Least 3 Out

question 26

Short Answer

You have been asked to select at least 3 out of 7 possible sites for oil exploration. Designate each site as S1, S2, S3, S4, S5, S6, and S7. The restrictions are:
Restriction 1. Evaluating sites S1 and S3 will prevent you from exploring site S7.
Restriction 2. Evaluating sites S2 or S4 will prevent you from assessing site S5.
Restriction 3. Of all the sites, at least 3 should be assessed.
Assuming that Si is a binary variable, write the constraint(s) for the second restriction.

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Definitions:

Impairment

A reduction in the recoverable amount of a fixed asset or goodwill below its book value, often reflecting decreased future earning potential.

E&E Assets

Exploration and Evaluation Assets, which are capitalized costs related to the exploration and evaluation of mineral resources before the technical feasibility and commercial viability are determined.

Commercially Feasible

A product or project is considered commercially feasible if it is likely to generate a sufficient level of income to outweigh its costs and risks.