Which of the following is true regarding the number of computations required to compute DFT at any one value of ‘k’?

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answerhappygod
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Which of the following is true regarding the number of computations required to compute DFT at any one value of ‘k’?

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a) 4N-2 real multiplications and 4N real additions
b) 4N real multiplications and 4N-4 real additions
c) 4N-2 real multiplications and 4N+2 real additions
d) 4N real multiplications and 4N-2 real additions
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