A real and odd periodic signal x[n] has fundamental period N = 7 and FS coefficients X [k]. Given that X  = j, X  = 2j, X  = 3j. The values of X ,X [-1], X [-2], and X [ -3] will be
Correct answer is option 'D'. Can you explain this answer?
If time period is seven then it must also repeat after (2N) times therefore it can be solved like this.
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