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Electrical engineers use it in calculating power factor and electrical load distribution when dealing with 3 phase power connections.
In the UK, electrical power plugs have standard 3 square pins. One pin is positive, second pin is negative, and the third (larger) pin is the earth.
3 to the 2nd power times 3 to the 5th power = 3x3 x 3x3x3x3x3 = 2187
3 to the 10th power.
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