Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$

question 121

Short Answer

Find $\mid A _ { 1 } \cup A _ { 2 } \cup A _ { 3 } \cup A _ { 4 }|$ if each set A_i has 100 elements, each intersection of two sets has 60 elements, each intersection of three sets has 20 elements, and there are 10 elements in all four sets.

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Definitions:

Screw Pitch Gauge

A toothed template gauge used for measuring screw pitch or threads per inch (tpi).

Threads Per Inch

A measure of the thread density in fasteners, indicating how many threads are present within an inch length of the screw.

Thread Angle

Refers to the angle between the sides of the thread profile on a screw or threaded component, typically measured in degrees.

Interstate Commerce

Trade, traffic, or transportation involving the movement of goods, services, money, or persons across state borders within the United States, subject to federal regulation.