Power Systems
How to find the total number of strands (N) when number of layers (x) are given

 Total number of strands N = 3x² - 3x - 1
 Total number of strands N = 3x² + 3x - 1
 Total number of strands N = 3x² - 3x + 1
 Total number of strands N = 3x² + 3x + 1

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Power Systems
In hydroelectric power plants

 both operating and initial cost are low.
 both operating and initial cost are high.
  operating cost is low and initial cost is high.
 operating cost is high and initial cost is low.

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