Power Systems
The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers)

 N = 3x²-6x+1
 N = 3x²-2x+1
 N = 3x²+3x+1
 N = 3x²-3x+1

ANSWER DOWNLOAD EXAMIANS APP