You Have Been Asked to Select at Least 3 Out

question 101

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 for the third restriction.

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Definitions:

Random Assignment

A method used in experiments to allocate participants to different groups purely by chance, minimizing preexisting differences.

Health

The state of complete physical, mental, and social well-being, not merely the absence of disease or infirmity.

Alcohol Users

Individuals who consume alcoholic beverages, either occasionally or regularly.

Nonusers

Individuals who do not use or participate in a specific service, product, or substance, in contrast to those who are active users.