Power Systems
In order to have lower cost of power generaion

 the load factor and diversity factor should be low
 the load factor should be high but diversity factor should be low
 The load factor and diversity factor should be high
 the load factor should be low but diversity factor should be high

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Power Systems
The value of off diagonal elements is

 sum of admittances connected at bus i
 sum of admittances connected at bus j
 which is connected between bus i and bus j with positive sign
 which is connected between bus i and bus j with negative sign

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