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If X1(k) and X2(k) are the N-point DFTs of X1(n) and x2(n) respectively, then what is the N-point DFT of x(n)=ax1(n)+bx2(n)?

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If X<sub>1</sub>(k) and X<sub>2</sub>(k) are the N-point DFTs of X<sub>1</sub>(n) and x<sub>2</sub>(n) respectively, then what is the N-point DFT of x(n)=ax<sub>1</sub>(n)+bx<sub>2</sub>(n)?






 
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