Which of the following is true regarding the number of computations requires to compute an N-point DFT?

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answerhappygod
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Which of the following is true regarding the number of computations requires to compute an N-point DFT?

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a) N2 complex multiplications and N(N-1) complex additions
b) N2 complex additions and N(N-1) complex multiplications
c) N2 complex multiplications and N(N+1) complex additions
d) N2 complex additions and N(N+1) complex multiplications
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